Not to start an oil war, but I kind of agree for my bike. My dad convinced me to put Redline in after getting the bike and the change from Syn3 to Redline made neutral harder to find and now it clunks a lot louder in the lower gears.
I've not heard this claim before, are you using shockproof heavy? I like the idea of it coating and sticking to the gears, for me that's a big plus.