If woodworking for you is a job and income then your time is valuable and shouldn't be spent on making biscuits of undetermined quality when buying the compressed commercial ones is relatively cheap.
IMHO - If you can not cut an accurate slot for biscuit location, need to perfect how to use the tool.... Store bought biscuits fit too loosely for my purpose, and the last time I used my biscuit joiner (Ryobi), the height of the cut wasn t terribly even. - MarkCh
ryobi…..well that could be part of the problem ?I have the Katana slot cutting bit from MLCS and a #20 biscuit fits snug in it. Maybe there s some play in the Ryobi biscuit jointer that makes an over sized slot.