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Does the 20 # guide rod cause any FTE or FTF (Fail To Feed) problems with ANY grain ammo?
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It depends on the recoil impulse of the ammo (not just bullet weight) and the grip of the shooter. I put a 15# recoil spring in an M&P 9 (stock 16#) that was short stroking on beginners; I never had any trouble with the stock spring.
Personally, I think a 20# spring in an SD 9mm is a bit much unless you intend shooting a steady diet of +P. On the other hand, the stock SD 9 is nominally 19#, so its not much over.