You can use a boost spider but you need also 2mm spacers to clear the swing arm this would put the sprocket 2mm off centre line - it is the optimal gearing especially if you use a speedbox, I think the clearance issue has been intentionally created to stop people going too fast ;)
Hello, I need a specialist supplier with knowledge to gear up my 2022 cube AT - I ran a 42t on my 2021 with a standard FSA boost spider but the clearance is less on the 22