I'd recommend upping your gauges to the following.
11-49 for the first 6 (DGCFAD), then throwing a .66 or .68 on the top for that low G. I personally use a .60 for Drop A, but since I stick to B Standard most of the time it works for me, if I were primarily in A, I'd be using a .62. But when I tune the low 7th to B1, it matches the tension of the Low E and works perfectly for that so I'd rather have it balanced out like that.
In fact, your current low string is mightly low in tension in comparison to your other strings. Your low A is something along the lines of 11lbs of tension, while your other 6 strings are around 16-17lbs.
.56 in A1 = 11.7lbs of Tension
.60 in A1 = 13.5lbs of Tension
.62 in A1 = 14.4lbs of Tension
.66 in G1 = 12.9lbs of Tension
.68 in G1 = 13.7lbs of Tension
You generally want the same tension across the board or at least something very close to the rest. Here's the tension calculation for the first 6 with the 11-52 set I recommended.
.49 in D2 = 15.6lbs of Tension - OR if you plan on tuning to Drop C AS WELL - .54 in C2 = 15.5lbs of Tension
.36 in G2 = 15.5lbs of Tension
.26 in C3 = 14.6lbs of Tension
.18 in F3 = 14.7lbs of Tension
.14 in A3 = 14.1lbs of Tension
.11 in D4 = 15.6lbs of Tension
This is simply the technical way of representing string tension, I honestly recommend grabbing a few sets of strings, and then ordering a slew of different low G string gauges so you can experiment. I experimented quite a bit before deciding on my .60 for B/A, hope this helped a bit!
