Glad it worked out for you. I use my ZST every day for bike riding because I like them so much with the mod.
I think it would certainly be beneficial to tune the ZS5 and the ZS6 to your individual taste. The method would be the same as the ZST mod. The only difference is that the nozzle screen is glued on with the ZS5 but just peel-n-stick with the ZS6.
where are the details on this mod? I seem to have missed it somewhere.