No "official" RTG info has been "officially" released by EA, only a leak by IGN on purpident(accident/purpose). So no in-depth info is really clear except for the new avenue RTG is taking with full HS season and build college interest and playing both sides. So its save to say nothing has been fixed once EA comes out with their blog or however they want to feature RTG.
Honestly on Heisman I havent had any problems with the D blitzing on runs or it affecting the whole game. I always ended up 5 star RB and winning states. Every now and then i had negative yards but what back doesnt.