hacker for 8th scale on 4s

Hey all. I have a converted hellfire that does not agree with cheap feigao's. Lucked up on a sale thread for some used hackers at a good price. Would you go 8xl and gear up or 7xl for use on 4s lipo ?

Just want your thoughts :). If the feigao's aren't holding up for me, is hacker enough higher quality to handle a fairly heavy conversion on the relatively lower voltage of 4s ? I'm wanting to get the 2 pole hacker so I can use my bk9920. I was leaning toward the 8xl so I would have room to jump up to 5 or 6s in the near future....

hacker 8xl = 1973kv
hacker 7xl = 2254kv