I was in the same position a couple of years ago long skinny thighs, lol. I personally found adding width to my stance helped me create more mass through muscle recruitment. It wasn't what I used for a 1RM or even heavy singles, but I used it for all my rep work. It really developed the inside of my quads and outside of my glutes. This along with AMRAP sets in 5/3/1 and BBB front squats put the size on relatively quickly.