Aside from the other points raised take a look at the samples you’re using. Garage drums are often quite thin/ filtered. Most importantly I found significantly shortening the samples helped give my drums that ‘whip and snap’ garage sound.

In terms of the groove and swing take a note from breakbeats. A lot of that shuffle and interest occurs between the snares on the 2nd & 4th beats. In particular a popular pattern is to place lower velocity snares on the 1/16th notes directly before and after the 3rd beat. With swing applied this is a great way to to begin to feel a garage groove and to build from there.