The title might have been a little misleading but I didn't know how else to put it: I'm trying to find the best gauge string for the lowest, 7th string tuned to drop A (25.5" scale). I'd also like the string to be usable in B standard and I happen to prefer the sound and feel of less thick strings, so I'm looking for the minimum usable gauge for drop A. Obviously this is largely subjective. My particular question though is, how much string tension is needed to maintain tuning stability. Any thoughts are appreciated, but what I'm particularly referring to by "tuning stability" (probably incorrectly so) is the ability of the string to stay in tune when struck with medium force. If a string is too low tension, I've found that when I strike the string it wobbles in and out of tune; objectively speaking, the dial jumps around on a tuner (whereas for other strings it does not). I've tried .062 (14.4 lbs of tension), no good. Most recently, I've tried .064 (15.3 lbs of tension), which is better, but still jumping around the tuner a fair bit when struck. Incidentally, I must not have been paying attention with the .062, but .064 appears to be the minimum gauge I can use for drop A on this guitar in terms of being able to achieve proper intonation. Obviously, I'm about to give .066 (16.3 lbs of tension) and .068 (17.2 lbs of tension, which matches the tension on the 6th string, .046 gauge, tuned to E) a shot next. May even go to .070, but I feel like then I'm getting into a territory where it won't be very usable for B standard (too much tension). Anyway, overly long post, sorry, but the basic question: are there guidelines regarding how many pounds of tension are required for an open note to not wobble in and out of tune when struck with medium intensity? Thanks!