Advice on FDR with Vampire Bloodline

[Tarquinj]

Hey guys,
I am after a little help if possible.

I am running an Xray T3 2011 with and FDR of 7.60 (84 Spur/21 Pinion) at present with a Speed Passion GT2.0 and a speed passion V3 Comp 13.5 boosted.

I have just purchased a Vampire Bloodline Type AB+ 13.5 and have been advised I need to reduce the FDR due to the increase in power from the new motor.

Does anyone have any advice, I run at a relativley small indoor Touring car club

Thanks in advance.