I've no idea what worksop track is like.
Big, small, bendy, open, tight, carpet, wood.........
But the starting point with a10.5 on stock spur (83?) would probably be about a 25/26.
If it's an rtr (78 spur) maybe a tooth less. Then adjust by motor/ESC temps and performance. THEN start mucking around with boost/turbo (if you are allowed it)
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