If only I had that power...
But clay should never be a fast surface, and Nadal does indeed deserve to dominate there same with grass needing to be fast and Federer should be able to dominate grass like he used to. It's the fact that we have insanely slow HC is what pisses me off (almost as much as those bolded country abbreviations
Yes, hardcourts are the main problem of course, but they are the vast majority of the tennis calendar, including two Slams. HC Slam matches featuring two of Nadal, Djokovic and Murray have become almost unwatchable, they will be pushatons since neither of them can hit through the other's defense.
Clay should be slow (maybe with a few midpaced tournaments), grass should be very fast, outdoor hardcourts should alternate between medium paced and fast but not too fast (maybe one or two slow HC tournaments), indoor tournaments should be fast. Something like this anyway
That way, you'd have to adapt in order to be a top player. We'd see more surface specialists of course, but you'd need to be able to adapt your game to different conditions to climb to the top of the rankings.