Seriously though, I think it's just a simple matter of prioritizing nodes in breach and not freaking out so much. There isn't really a new set of strategy that needs to be figured out, every team uses the same strategy and it's only a matter of how well it's being executed.
To recap:
Somerset-
The top three nodes, delta-alpha-echo, are the only nodes people should concentrate on getting, the bottom two (bravo and charlie) must be ignored until those three are secured. Stop screwing around trying to get bravo and charlie when the offense needs help on the delta-alpha-echo route, and yes, bravo and charlie is a ****ing waste of time in a Somerset breach match, when the other team gets pounded hard in their base, they'll concede those nodes to you even though you probably won't be attacking through them.
The top node closest to base (either delta or echo) needs to be firmly secured because defense gets POUNDED hard if the opposition gets possession of it and it's very difficult to take back, AND the node has the arc charger, auger AND the laark, not securing the node and instead off rushing the enemy base is essentially screwing over the defense in a serious way. The defense needs to keep an eye on the closest top node to make sure that is secured, you defend echo or delta and NOT give up the node and have to deal with people coming up that hill rushing you with laark AND auger AND arc charger, there's a wall right there one can shoot the auger through and hit the reactor for massive damage without the need to get close to the reactor. Offense needs to drop the idea of "oh we have delta and can rush the base now, so what if we lose echo and the defense will get screwed? Let's rush the base!!!" mentality.
Nottingham-
Alpha, the middle node Bravo, always hold the node closest to base (either echo or delta), everything else is secondary. Alpha and the node closest to base are crucial because alpha has BOTH the auger and the laark and it's very hard on the defense, people rushing from alpha will pick up either or both AND the hedgehog grenade is right there along the way, very hard on the defense. Potshots from auger in the tunnel are VERY HARD TO DEFEND AGAINST, they don't even have to make it all the way in before firing auger shots and you have no way of blocking it, the defense working in the tunnel can get hit by auger shots fired from alpha and get picked off while trying to keep the tunnel clear, that's why alpha is crucial.
Defense needs to keep an eye on and make sure the closest node is secured.
Grimsby-
It's all about papa, everything goes through papa, there's no going around it.
Manchester-
It's all about kilo and lima, you cannot win without having them, period.
Sometimes the other team might ignore a node but it doesn't mean it's a good idea to leave the node you're attacking and going for the one they're giving you.
The reason you're getting the node is NOT because the other team is leaving it open, it's because if the other team has it, your defense is SCREWED CONSTANTLY, because 1) those nodes have the best ****ing weapons, 2) those nodes have the shortest distance separating them from your home base and it's easy to get overwhelmed, that's the same reason the offense goes after the corresponding nodes on the map.
It's GREAT that some people thought getting charlie in Nottingham is a good idea without having the node closest to your base secured, but you're spawning furthest from the enemy base, and you're getting hit from both echo and delta. The reason why you're taking charlie is because you've secured echo (if that's the closest one to your base) and you're trying to take delta when combined with the force from bravo.
There's a reason why the other team goes for certain nodes, because those are the nodes it takes to win the round, the offense can't just "give up" on a key node and go for "something easier". Oh and you don't rush the base until you're certain THE NODE YOU'RE SPAWNING FROM to attack the base is at least secured.
You don't need all the nodes to win a breach game, true, but if you have one node and you're facing sentry guns AND mines, and your defense is getting pounded because all the offense cares about is "rushing the base" and the closet node is taken by the other team, then it's time to rethink what the priority should be.
Clans are too smart to fall for the whole "mass rush" tactic, don't even try it, better yet, don't even suggest it.
These ARE the strategies that work, everybody should know them and stick to them, other clans sure as hell know them well nowadays.