Yeah I skimmed earlier, was on the way out at the time. Glad to see someone else thought of the same thing.
One way to balance it is to make the rebuilds faster based on weight. Therefore the heavier ships would take longer than the lighter ones. The Mobula is almost all balloon so if this was changed, it would mean an already weak ship suddenly becomes even worse with huge rebuild times. But if we take into account weight, could give the mobby a high balloon HP with moderate rebuild. Junker would likely fall into a decent spot too.
So down the list...
Galleon: High HP, Slow Rebuild
Pyra: Mid HP, Slow Rebuild (wouldn't really hurt it much, it has armor around part of it after all)
Junker: High HP, Fast-Mid rebuild
Mobula: High HP, Fast-Mid rebuild
Goldfish: Mid HP, Mid Rebuild
Spire: Low HP, Fast Rebuild
Squid: Low HP, Fast Rebuild
Think that might be how it would work out. Anyone else have an edit?
If Hydro goes % based. Would work. Think in tactics, the tactical balloon blow maneuver would become popular for some lighter builds. Then if HP is high enough on the more exposed Galleons, the blender would have to sit there blending for awhile to chop it. With repairs going on/etc. It could buy a vessel enough time to counter or have allies arrive to assist.