Hi Craig.
6.5 isn't ideal for cullingworth, what with the hall being so small. Its always best to reduce the actual motor rather than turn it down. To be fair a 13.5 would probably be the ideal motor for cullingworth! Your 6.5 is really best suited for outdoors or massive indoor tracks. Having said all that though, I run a 7.5 in my car and also turn it down quite a bit. It saves me having to swap motors for different venues.
I would say, if your not struggling then leave it, or if you do want a dedicated cullingworth motor go for a 13.5 or 10.5 at the most.
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