I'm using ernie ball reguler slinkys on my alexi, but I feel that the high E sting is a little to thick for my liking. Would it affect anything if I swap in a high e string from a set of super slinkys instead? Kinda a stupid question i know, but just making sure.
Go for it. It's only a one string difference in tension, you still got the same ol' 5 strings there to keep the tension balanced.
it won't hurt at all.