I am planning on replacing my pump, pretty sure its too big

[SunnyOptimism]

Given the size (volume) of your pool, 1.5HP would be the biggest pump you should ever use. Also, seeing your setup with the skimmer and return so close, I can easily see how a 1.5HP single speed pump would just blow water right through your pool.

As I said in earlier posts, you never want to overdrive a small sand filter with a big pump. Not only can you damage the filter with a high power pump but also sand filters work best at low flow rates.

So, in your situation, I personally would go with separate purchases and forget the combo units. I agree with others' sentiments that the pumps on those units are typically too big for the filter. I would much rather go with a 2-speed, 1HP pump and save the money so I could spend it on a bigger filter. Also, with all I have read, I have heard many times that a good 2-speed, 3/4 HP pump is all most standard residential AG pools need.

What's the history of your pool? Did you inherit it? Do you why such a big pump is on there in the first place?