look in the melee gear thread,
melee gear thread will do no reason to start a new thread.
Even if you hit haste cap with omnipotent there is still no reason to melee in serpentes set. Swap out the hands for dusk gloves, augment your legs with critical hit dmg +3% and double atk +2%, but even then I'm not sure that they would beat out tumbler trunks for a ws peice.
For the ws set again check the mellee page I haven't had the chance to play much so I have 30 more skins to go to finish my 85 Almace.
But as far as it goes with rdm having next to none access to critical hit rate/damage gear, it's better to cap out or get as close to as you can your haste from gear and use atmas that provide higher amounts of critical hit rate, like gnarled horn(shouldn't need to say anything about it's usefulness with /nin and a crit based ws), scorpion queen would even provide you with a 10% increase and the stp +20 would be enough to shave off 3-4 hits, the other 1 or 2 atmas I can't recall and the day has been long. You aren't going to exceed the critical hit cap without the use of atma's and your dex is so already going to be so high that adding another 50 isn't going to do but around +25 damage to your ws where as using gnarled horn or the others is going to boost you damage WAY higher then that. It is unknown whether light gorget actually works on CDC so you should swap that to a snow.