Mcx290 apex clutching help

[T-rav 27]

Hey guys i have a 290 mcx rear mount apex im teying to figure out clutching for 1320ft radar runs curently running supertips at 77 grams with a w-w-w primary with a 45-39 helix with pink spring with stock gearing it dosent seem to be pulling that great and im at about 10 600 rpms anyone have a recomendition on helix and springs may have to order a few

 

[ClutchMaster]

Run a 51-43 helix with cat green snopro spring 0-1, 8dn belt. Can’t remember how weights were loaded but it was with super tips around 300hp. Primary spring?
That’s all I can remember.