You need to be more logical with your set choices. Pick a stat that you are looking to boost and chase it.
for example each time you have slotted a purple set you have put 6 IOs in. This is gaining you psionic defence, which really isn't very useful in the grand scheme of things and each of the Damage set could be replaced with either a % chance for damage proc from another set or that slot taken and moved to slot other things.
You could use your other powers to chase more recharge, either on the cheap with 5 slots of doctored wounds or less budget friendly using Panacea (don't forget 1x 6 slots of preventative medicine for sweet 8.75% recharge + absorb proc)
another option you could take is to slot for some ranged defence and sit out of melee range of your enemies with hover. However I would not recommend achieving this by slotting slow sets like you have in dehydrate. If you do go this route aim for at least 32.5% ranged defence. Please note that regen has 0 defence baked into the set, so anything you gain will be purely from pool power picks and set bonuses (Hover, combat jumping, weave, manoeuvres, link minds), this will limit your options for offense slotting however regen works REALLY well with any kind of layered defence as it has such good healing capabilities already.
Water blast works quite nicely with damage procs, however there is nothing stopping you building for set bonuses π
my last pointer would be to make sure you have your global procs slotted up which you seem to mostly have. Performance shifter +end proc can go in both stamina and quick recovery. I would start there. If you have spare slots slot up QR first over stamina base slot as it is stronger. Also make sure you have the panacea proc slotted somewhere early too (either health or one of your other regen powers)
I would also strongly recommend a Kismet +to hit proc in an early defence based toggle such as hover.