also im having issues with mana, would it be effective if i were to go BM node instead of using gems?
This could certainly work, but the Hatred aura is not only a huge dps boost, but the freeze crits that come from Hatred make your life much easier in pve, and give you a huge edge in pvp. I would much sooner use a BM gem on all attacks instead of using the BM keystone and giving up the Hatred aura.
If you're having mana issues, it's bc your dps is too low, so you need to compensate by getting more mana leech. While leveling, it is super helpful to have the surgeon's affix on your mana pots so you can almost spam it and never run out. On my duelist, all he uses is a single hallowed hybrid flask and that is all he needs for mana pots, even on no regen maps. And to be clear, all he has is 1% mana leech, and that is enough to be at full after every fight.