Anything to improve holding power with stock setup

[Mr.Spool]

braided steel lines

these are the things that go a long way as the steel wont expand like the rubber ones,that with the synthetic fluid made a big difference on mine.

 

[Mr.Spool]

I've only did an ebrake launch once. I'm sure with practice I might be able to get a better time, but I only netted 0.04s better.

if you leave with the same amount of boost/rpm I could see that but if the ebrake allows you too hold more boost and you have the right tire on the car it shouldn't be close,i have left on 20psi off the ebrake before.