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Which set do you like on your six string? And which scale length and tuning?
10-59 is standard D tuning with a low A string on the RGD.
With NYXL 11-64, I had too much tension at A & had to go down to G# standard.
For Drop G, 10-46 with a low 64 would work great, for Drop G#, 11-49 with a low 68 will work.
Those saying to use an 80 or so are not taking into account that the nut on the UC version is not cut wide enough for those strings at the factory. Going above 68 is going to require some nut filing, and really, even at Drop Gb, 68 at 26.5" will be great as long as you have a touch of relief to the neck.
It depends, it's normal for people to be used to less tension on the bottom because of the badly constructed 7 string sets that are even more imbalanced in drop tuning.
If you want the 7th string to actually feel like the rest of the guitar using something like the sets I showed for the 6 string portion, then at least a 75 is necessary. A 64 G would feel like a 40 E, that's very loose by most standards.
Yes the nut will need filing for sure
Think of it this way - stock 8 string sets come with a 74 for Gb and assume 27" generally. Many people find that a bit too loose also. So it's a good ballpark