I get what you are saying but the fact you have had the front setup and coilovers setup/fitted really makes your first post a bit misleading as you aint run rear beem and not had front done so you don't know that its that that has fixed the understeer.

Not trying to have a dig either, trying to understand why more grip on rear aids front end grip, there is other theories about taking away lateral grip over forward grip, this should dial out some understeer, but will reduce the lateral grip.....all in theory tho.....if the car drives well then it drives well, which is the only thing that matters