The underwater combat is not that hard but a proper builds and rotations always help. Thanks
Fresh Air Tempest:
Overload Air -> Fire 2 -> Air 1 until Overload is ready -> repeat.
Use Air 4 for CC.
Replace Fire 2 with Earth 4 for more CC.
I'm playing around with my normal Weaver build recently, but I have no idea how it compares. It's fun to play though. Basically what I do is [Non-Fire] -> Fire -> Fire -> [Non-Fire] -> Fire -> Fire -> ...
Water and Air both seem to have good damage. Air or Earth again for their 4 if you see you'll need CC soon.
You can run Weaver Fresh Air too, dual-attuning Air instead of Fire in the rotation. You'll have great Elements of Rage uptime and you'll always have easy access to the Air 4 CC.
I'll need to run some Aquatic Ruins to see which one is optimal.
P.S. I run instant-cast utilities - "Feel the Burn!" for tempest, and/or arcane skills. For Tempest, time them with your Fresh Air ferocity buff. For Weaver, time them with your dual attune.
Air 2 is very strong now in wvw it seems. Its dose an aoe daze. I kind of wish you could use the trident on land now.