Trying to make it into a giant jacuzzi?

A 1/2 hp uprated pump is pretty much overkill on your pool. If you could find a 1/4 or 1/3 hp you'd have more than you'd EVER need.

I run a 1hp full-rated 2 speed on my 16x40 and run it on low speed most of the time. I wouldn't go any higher and I have 20,000 gallons and you have, at most 5,000.