I'd have 4 mexes next to com with 1 extra mex and a hydro close by for each player (please no double hydro for anyone, you don't want to be forcing metagame, let players decide if they want to air or not). Land players should have expanding mexes in controversial territory.
I'd move the mexes closest to the center further towards the middle of the map so t1 arty can harass them from both sides. A similar thing could be done with the bottom mexes of the main landmass, they should be easily harassed by frigates. Continuing the theme of land aggression: reclaim should also be available in the middle. Not in the form of t3 wrecks, but tons of trees, rocks and maybe t1-t2 wrecks. Maybe add even more mexes, so it truly becomes a full blown fight for the middle landmass instead of a turtlefest. I personally don't think the bottom island needs any changes. As long as frigates can easily harass those mexes aurora/zthuee spam doesn't seem like a huge problem. It'd be interesting to have a couple of underwater mexes though.
With all of these changes the map should become much more aggressive.