I've fiddled about with tents - adding extra guys; getting better pegs; sewing on extra pegging & guy attachment points, that sort of thing
I've also changed all the guy runners for the 3 - hole triangular type, which I find the easiest to use
I treated the zips with Ziplube
it does no ham to re - proof your tents; Granger's Fabsil is as good as any