I'll try to post when on a real PC ... phone just dropped tiwce
Start with std 5x1.3 in the front, 35-40wt, Losi Green spring
5x1.4 (drilled from std) in rear with 25wt, Kyosho / X-gear RED (or Losi Pink as VERY close)
Run that with your normal setup and work from there ... please get back to me with full setup details and I'll try to help you from there :0