There is not a way to exclude one particular item right now.
The legendary chest has such good stats, that the mediocre on-use effect is acceptable as far as damage goes. Unless you have boots/wrist - it will probably end up being your next best legendary item. It took some getting used to, but I actually found there were a lot of good uses for the buffed CJL. Examples would be like when you have to go hide behind a pillar on Goroth, you can use that time to channel CJL and not lose damage.