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1 & 2: Sounds like the shimming is bad. Too much friction = hard to cycle gears = overheated motor (working too hard) and locked up gears. This could also have led to your piston breaking in the first place. There could be other problems as well - problems with the mechbox rails, a warped mechbox frame, worn out bushings....a lot of things a novice wouldn't notice.
#3 - It sounds like something is messed up with the hopup, but it could also be a buggered/disconnected nozzle, or a busted tappet plate. When you take the barrel out and take the hopup apart, just insert a bb in the barrel and see if gravity lets it roll thru. It it doesn't, there's an obstruction in the barrel, or the barrel may be bent. It could also be a damaged piston head, piston head oring, cylinder head, cylinder head oring, a torn hopup rubber, or even an out-of-round cylinder causing massive compression loss....
Being in Calgary, there are lots of competent gun docs in your area. If you really have little idea of what you're doing, it would be time and money well spent to pay someone for a couple of hours of their time to sit down with you and go through your gun with you. What you pay for "private lessons" may save you just as much in damaged parts from incorrect installation. Well worth the money IMHO.
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