A question about gearing
 

Hello this is really two questions in one, firstly I have a Yokomo b max 2 that i've just got set up it has a 6.5turn speed passion competition v3 motor and I'll be running saddle lipo's at 5000mah, I understand how FDR works for gearing and that but looking at the instructions the lowest pinion size you can use is 20t now I have set this up at 23/80 will this be okay as the track I'll be running on is pretty tight so I'm looking more for accelaration it gives me an FDR of 9.4. My second question is concerning at Associated B44.2 again it's about gearing but this time with a 13.5T would it be okay setting this up at 23/81 that gives me a FDR of 8.80, I hope someone can help as I'm having trouble figuring out whats needed cheers.