Alex cbr600

So far I'm on my 5th pair of gloves. 1 set I managed to return, 2nd set I bought off FB for a steal, 3rd set I have worn once but marked so unable to return, 4th I have treated and tried to stretch but making do as it's getting expensive and the 5th are winter gloves and kind of fit. Problem I have is very large palms, so xl gloves fit my fingers but when gripping my thump is badly squished and causes hand cramp after about an hour of riding. Looking at custom made gloves, anyone had to do the same and could recommend somewhere? Thanks