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Poorly spliced together wiring is never going to help anything...
Not sure why you did it that way? If you need those types of spade connectors, you can get them (both the male and female ends) at Canadian Tire (automotive section...usually with the fuses). Get some shrink wrap at the same time to make a cover/insulator for the hook up.
The reinforced mechbox could very well be tighter in the lower compared to a stock TM mechbox. The selector plate is beefier as well. This would make the selector hard to turn/sticky. If you're forcing it to semi and then full auto...don't. You'll just wear or strip out the lever/disk. Try disassembling it and reassemble it...look for signs of where/what is rubbing (i.e. selector disk, selector plate, the left bushing of the spur gear, etc...).
Anyway...that still doesn't answer why you'd get multiple bbs with each shot.
So when you get it firing on semi (try moving the selector just a hair or two past semi), you get more than one shot at a time? No dry shots at all?
If so, then I'd guess that your nozzle has jumped off the tappet plate, the tappet plate is broken or your hopup/hopup rubber is broken.
Better see a gun doc at that point.
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