Upping the spring weight in order to run a lighter buffer without changing any of the gas system related parts is silly. Most aftermarket stuff fails, because reinventing the wheel mathematically is worse.
With carbines that are inherently overgassed, ADDING reciprocal weight is still what you want do to. If your 11.5" is still back-heavy with a can on it, I have the feeling you're running a needlessly heavy stock. H2/Sprinco Blue is my preferred setup, other than the VLTOR A5 kit in stock form, but I haven't had any issues with an H buffer and stock spring.
The A5 makes sense to me (indifferent about that little spring - obviously it can run without that) just because it makes better use of the RE length, and has no negative effect on OAL when used with an ACS or EMOD stock.
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"Being able to do the basics, on demand, takes practice. " - Sinister
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