On the subject of the gain from the UA5 into the NJ3, I've found that NJ3 can handle peaks very well so far... My UA5 was flashing like a firetruck at the recent Lake Trout show at the very beginning... I turned down...
Later at home, I discovered the first part was fuller and better... I shouldn't have turned down...
Oh well, you live, you learn, you tape some more!
Terry