Advice on brake pressure and bias

I wanted to know all thoughts on brakes in forza 5 I tune with feel , telematary and benchmarks . I feel the benchmark says it’s the quickest distance on braking but it feels to skid out at the back and loose ?

I put some if this down to getting diff right too but could the benchmarks be wrong ?

My standard start on brakes is about 60% front 40% rear and around 104%

I run ABS AND TC

Please let me know your thoughts as I am confused slightly and would happily start the debate !

Cheers all

The other thread http://forums.forzamotorsport.net/turn10_postst15785_BRAKE-BIAS-EXPLAINED.aspx