I have one bow that always goes high, it is lighter than the others. My issue is finger pressure. If I used too much pull on the bottom finger, it goes high (bouncing off shelf maybe).
Just a thought with you having the opposite issue, maybe use more pressure on bottom finger. The pressure variance will adjust limb, tiller during draw, especially on bows under 50 lbs for me. I assume the top limb is bending more than the bottom or maybe the tiller is more positive on top than you are used too.
Just my thoughts, my wife says I'm usually wrong though-ha!