MrG, yes, I have the same leakage when the pump is removed. There's always gonna be something less than 100% when dealing with the pumps and rings. I find that the best I do, I still get some amount of extra tissue inside the ring, so when I push this extra back out, I lose some more then.
I just may try the full pump and inject thing and see what happens (if I don't find a caution against it somewhere)