I would take it back to the pro shop, the thumb should not be that tight, normally you should have the thumb hole so its a bit loose to compensate for swelling, and when your thumb is "smaller" you can add tape to get a conferrable grip.
you may not need to have the thump plugged to fix this, often the pro shop can just expand the thump slightly either by shaving down the slug or drilling it out a bit more.
the marauder shouldn't be taking your thumb prisoner!
if it's just a matter of you not letting go, then relax your hand and let the thumb come out freely, but i don't know how this could cause you to "almost chuck it into the ceiling tiles"



					
				
					
					
					
					
				



 <-- neo LOL
						
 I also had some additional confirmation this evening when I picked up the ball and attempted to do some armswing drills. My fingers and thumb were all sore from not holding the ball right last night and I could barely hold the ball, plus my thumb was too swollen for the drills to do any good. I put the ball away shortly after getting it out. I will have to give my hand a break and wait for the soreness and swelling to go down before I can try this again. Even if I chose not to listen to anyone here, my hand won't let me get away with holding the ball incorrectly for long. So there's my answer. 
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