650-680 is a kinda hard leveling area without crystal gear and at 650 the best set up is with 2 sets that are Crystalline. If you have unbreakable 175 or higher active, during your hunts, they last for a few hundred hunts which should easily put you in the range of a new set up.
The truth is I used your current gear until 675-680 and one hit just fine with the right buffs and potions. (Potion of Black Death, Potion of Fury, Potion of incandescent fury, Potion of Truth, Smashing hammer, coordinated attack and epic forge with the rest normal hunting buffs.) I wasn't able to take down Elites or Champions without using imps but it met my leveling needs.
Then at 680 I was using Kifos, Yojimbos, Jumbos Jolly and Ballista sets with Twisted Cherub Amethyst Band (all not crystalline.) But then again at 750 you need to start using crystalline again to one hit. I wasn't able to one hit without crystalline until I was at level 850.
Thank you for your response. I may end up having to do the same thing and just get as many levels as I can out of my current gear. I made several attempts to make up a gear set for around my level but it always came down to using crystalline gear. Up until now choosing what gear to buy hasn't been a problem and has been pretty straight forward.
If worse comes to worse and I start dying or being unable to one shot mobs I may have to suck it up and use crystalline gear. Though I don't like the idea of buying gear that breaks.
Thanks again for replying