Hello everyone, i bought a 7string guitar with 26.5" scale length,it was second hand, and the owner told me that it had some rottosound 10s, the problem is that the tension on the low Bb is very low and it gives alot of buzzing... i thought it was because of the action, i gave it almost 3mm of action and it still buzzes... the truss rod is also ok, so it lead me to say that the problem is the tension of this specific string.. im not sure but the 10s 7sting packs of rottosound give a 56 as a 7th string..which some people told me that it has very low tension for a 7 sting guitar...i think it gives about 14 lbs, what do you think? should a bigger gauge fix the problem? what set would you suggest? on my 6strings i play with 9s and 10s, on E standar and Eb tunings.. some times i drop the Eb to C#... the sevenstring will be also in these tunings... Bb and Droped some times..