I think that with incoming U50 and U51 update there should be done changes in some epic feats.

1.) They should boost Epic spell power feats.
Now it give +20 for given element. I think +20 or +25 is fine if its granted for every element (so add new feat Master epic spell power that gives +25 to each element). That feat could be good choice for wizard.
But for specialized element it should give at least like +50.

2.) They should fix Hellball feat.
Now it is useless feat. Damage output should be higher to motivate players pick it.
It should deal about 1/2 damage of energy burst. And should have quicker cd than energy burst.

3.) Improve Ruin and Greater ruin feats.
It should cost fewer spell points to cast. Say about 35% cheaper than now (maybe even 50% but 35% is good start).


There are maybe more feats to improve but this is good starting point.