Speed Passion V3.0 little sluggish in B4

[markwilliamson2001]

Hi folks

I run a SP 3.0 8.5 in my B4 at club.
So far very impressed, very smooth and driveable in the medium sized hall.

After 5 mins motor is quite cool, geared 81/23 (I normally guage on 3 teeth down from an outside gearing), which is okay.

Is there anything I can do to try and give it a touch more top end and oomph?
I did consider going down a tooth, and turning the timing up a small amount, would this work?

And I am running a SP gt2.0 LPF speedo, pretty much stock, just slightly more drag brake on 2 (5%).