you may be better off starting a new thread rather than resurrecting a 2 year old one. a lot of comments are going to be in regard to the OP as some are too lazy to read the entire thread(like myself) or look at date stamps.
do you have all of those problems with the original mag as well or just the replacement mag? if it's the replacement magazine only then I would suggest taking it to a skilled gunsmith and having him modify the magazine to meet the exact specifications of the original, many replacement magazines currently availiable suck in C&R guns.
another thing you could try is a thorough cleaning and lubing and paying special attention to the grip safety.
all guns lost in a tragic smelting accident.
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Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.