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Another Shockproof user here. Made a big difference. Although my tranny was full of water when I bought the bike (breather line was clogged with a mud-dopper nest). It's like super thick pepto-bismol and smells, but works great.
OP, I use both in my two bikes, the Redline is in the 94 and it reduces the 1st gear clunk for me, the twinkie is fine with the regular gear oil... If your's is quiet and shifting well with what you are using then I'd stay with it....