"Approx 15' to 17' lift" is very important. If it is actually 22', the pump won't lift that far. Even 17' with 121' of pipe with friction loss is probably more than the pump can do. Since it is a convertable jet, move the jet assembly to the waters edge. You will have to run two pipes to the water instead of one this way, but the jet will be pushing water instead of sucking, and it can move water from a lot farther away.