I got another problem now, the bottom side on my thumb towards the middle between the thumb and the index finger is bruised. This has to do with my gripping of the racket. I'm using the correct grip, but when I smash, I think I hold the racket too tightly or something about my grip changes. I don't know what the problem is, so I'm limited to about 2 hours of play before too much pain, and about 1 week recovery. Then repeat.
Anyone have any suggestions? Before saying, 'use proper grip', know that the grip I use when smashing is much like a subconscious action, I go into the smash with the correct grip, but somehow end up with something else.
Also, another question. If I have a big hand do I use more grip? As in more layers or larger grip size.
Everyone has a different preference, but my understanding is that when you squeeze your hand real tight on the handle (eg. smash), your 3rd and 4th fingers should just barely touch the base of your thumb, if you're using the right grip size.