Hardly anyone accepts job invites with all the glitching going on, so I have been grinding out Gerald missions solo. I can complete Deal Breaker, Violent Duct, Pier Pressure, No Hay Bronca and Flood in the LS River on hard.
The key to beating these jobs solo, is staying put after you pick up the package. Get some cover and shoot up the reinforcements when they arrive, then you can take all the time you want to pick up cash and ammo. However, on No Hoy Bronca a van with four enemies shows up as soon as you enter the yellow circle. So on that job, I get on the roof directly opposite the deal, shoot up the guys there. Trigger the first van and get in cover, kill those guys. Right after that four more vans show up, deal with those guys then deliver the package. Then you have to go destroy some gang vehicles. This is the hardest part. I found the best way to beat it is to get on the roofs and fight it out from there. Use the slopes of the roofs as cover. There is no real place to cling to a wall so you have to keep moving, you will get shot at from lots of directions. After you destroy the first vehicle a group of enemies will spawn, I remember about 6 I think, and they come running so they may fan out between the buildings instead of coming wrapped in a nice neat package like a big van. After blowing up all the vehicles you have to chase down one last dude. Here I never caught the guy, but I got a mission passed any how. I was struggling to find a car after he spawned and he got a ton of distance on me. I don't know if he died in traffic or the game had mercy on me. I'll be ready with a car nearby next time.
On Flood in the LS river, I find sniping everyone from the hillside before driving down in the river way is easiest, but you could shoot it out down in the river. Before I unlocked the sniper rifle, I used the long orange barrier on the bank opposite the deal as my cover. Then I crossed the river after I killed enough enemies. Pick up the package and grab some cover. You get three vans arriving here and one may or may not drive up behind you, be ready for that. Kill 'em all, then a nice easy drive out.
Pier Pressure, Violent Duct and Deal Breaker are the easiest. Don't rush in. Get cover and kill everyone. Get the package and wait for the van to show up, kill them. Drive home, and in Pier Pressure there are no reinforcements, just shoot everyone then deliver the package
I haven't tried Meth'd Up solo yet, it just hasn't been offered. I'm level 24, I forget when it is unlocked, pretty sure I have it available though. But, Meth'd Up looks to be fairly difficult because I think enemies keep spawning until you reach a certain distance from the drop off zone with the RV. Shooting while driving is horrendous so I don't look forward to cracking that one.
Have any of you guys solo'd Meth'd Up or any of the other jobs where you fight AI? I don't really care to try Simeon's jobs because it usually involves dodging a wanted level while driving a car whose value will drop if you bang it up. And it always seems to rain in game when I get his jobs, making the drive that much more difficult. But I'll give it a go if it's worth the effort.