In honesty, I don't see you getting a notably better deal.
I'd ask them to reduce the rate, based on the good repayment performance, to date. If they do reduce the rate, then great, if they don't, then you may be better off living with it and being content - not least, because you may need them again, in the future, and it's a good relationship to have established.
Loans to sports clubs are not particularly popular with Banks, because all Banks have had problems with them, in the past - be it gold clubs, GAA clubs etc.