Also, for these types of techniques, i think a balance of 58-60 braking in the front should help, even if the car has a good weight distribuition.
60 will normally still lock up the rear first in a straight line. Depending on how much more front side-slip angle than rear you put on while trail-braking, 60 should be fine though and not send your rear flying first.
But the brake balances in pCARS1 and 2 are weird. In reality even cars with a very low and rearward CoG like a 911 GT3 Cup (62/38 weight balance ; 270mm front tire width / 310mm rear) have an ideal brake balance of ~61% front (Formula 1 is about 58-60 front too, over 60 even on courses with the most important braking zones at over 200km/h).
So many cars in pCARS1 and 2 have default brake balance settings under 60(?!). Of course, if you don't get to the highest possible deceleration and almost always underbrake the car, you are closer to the best deceleration with a more rearward (fake edit: "closer to 50/50") brake balance, because the ideal brake balance changes with the amount of weight shifted - if you pussy-foot the brake pedal, a 50/50 brake balance will decelerate the car more than the ideal threshold brake balance of maybe 35r/65f.
And another thing most people don't consider:
The center of gravity height, not the weight distribution, is the most important criterion for the ideal brake balance, the lower the CoG, the closer the ideal brake balance will be to 50/50 (unless you have very different tire widths front to rear of course).
