I read in the tech section for my stock viper 53/43 helix and green secondary spring is the way to go.What is if I use 51/43 helix??? slightly slower upshift than the 53??? it will still be better than the straight 47 helix I assume,Any info/help would be great THANKS !!! 
Lots of people are using the 51/43 helix. Seems to be a very popular mod.Start with the green spring at 70 wrap. You may want to also dig into the primary and make sure it is in tip top shape.It needs to grab the belt well in order to make the multi angle helix to work properly