Well as for a stand point, you would want to max out your entire MP slot, DON'T enchant Magical or anything MP based onto your alchemy gear because MP is easy to max out. Once you do that just try to get a good abyss cylinder and do not use the Tetra for damage. It is a ultilty cylinder lol as in its for rain casting,Hydra,Frozen blast and other support alch skills but not for damage but anyways for water cannon reforge wise you wanna roll a water alchemic damage reforge since it is stronger than water cannon max but hey if you roll a dual reforge that's even better.
Honestly, I'm glad there are more and more server merge threads showing up. From what I've seen in the past the more vocal you are about a problem the bigger your chances of getting a result or fix will be. I'm tired of having a dead market and seeing the same shops everyday as well as multiple bot shops now on Tarlach. I don't even have the desire to log in. I rarely complain publicly, but I'm going to join in on the complaint train about doing a server merge - We need one, yesterday.
The problem is we have been vocal about this for YEARS. I have come to the conclusion they are unable to do it for whatever reasons.