Re: 13-65 gauge, too thick?
well, with most guitar tuner pegs the hole is big enough to handle a .65, now if it will be enough tension for drop b is all about you and your hands, for me the most perfect tension on a string set i ever played was a 12 to 65 set, a 12 to 52 set from which i ditched the 4th string and slapped the .65 as 6th, i used that for E standard on my v (the one from my profile pic, 25.5 scale, then i learnt to live with 10 to 46 gauge since doing that set was hard and quite expensive), i can see 13 to 65 set totally working for drop b, i would be a bit more concerned about the bridge and nut than about the tuners, as you will have to widen the string slots on the saddles and nut