I’m almost the same scenario, I’m probably down 2’ as well
Dug it last fall, 9’ deep, filled quickly, we haven’t had rain in weeks (besides just raining briefly today) decently hot out. I was worried about the drop so I added damit pond sealer in about a month ago before having it stocked, still having loss in water and after all the reading I’ve done, I’m chalking it up as the soil is being saturated. I have really good clay so I was surprised it was dropping at the rate it was.
I do plan to add a sand point well in with a pump to get it back to full so I don’t need to worry but don’t think it’s necessary. I just know I will be using the well in the future for other uses in the so I don’t mind digging it.
