Unfortunately, its starting to sound like a leak at the pump intake, very possible because you don't get bubbles with the pump submerged. If possible, swap out your elbow (which, coincidentally, is what I'm using as well), and replace it with the original 1/2 fitting (if you're running 3/8, then thats not gonna happen), and whatever happens, you'll know if the intake is really the problem. If its something else, at least you've narrowed down the possibilities. With my elbow, I'm using a bit of teflon tape, as well as a large screw-type hose clamp on the pump intake itself, just so I don't crack the intake like I did with my danner. Dunno if the clamp helps the seal, but its certainly comforting Teflon tape really helped seal my pump outlet with another elbow.
Sorry if this doesn't help
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