Yeah, that's your problem. Half inch is very restrictive. The RC calculators don't even include half inch as a choice.
I would suggest redoing it with at least 3/4, using glued PVC. Just because the output on a pump is a certain size doesn't mean you have to use that size - adapt up at the source.
With 3/4 you should get around 150 gph based on a very rough run through the calculator (with guessing). Half inch would be just around the fourth root of that (flow varies as radius to the fourth power I seem to remember) which is about 3.5 gph. ie almost nothing.
Experience is nothing more than a long line of screw ups!!! Have fun.
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