I don't like shield gating because then you need to cast something every second unless ur try harding. range is kept the same because lowering it would be disadvantageous but there is no need for him to feast on enemies one kilometer away. Not keeping high effieceny and duration but instead going for strength as you can make up for the loss from [Gourmand] with spamming 2 which gives 1000 health on cast as well as being the only thing actually using your energy pool. your energy pool should be fine as with this build nourished energy turns 25 energy orbs into 75 energy. I will need further testing to see if some of the survivability mods are needed

helminth options are: (replace his 3 or 4)
Gloom - if you dont have any good survivability arcanes this is a good choice how ever you might need arcane energize to have sufficent energy
dispensary - if you don't have survivability arcanes and don't want to use gloom then the extra energy allows more spam of 2 for extra health and also the health drops
roar - if you want to buff feast damage and how much devour gives you.