My guess based on what you are saying is that float loading is allowing you to clear the right hip coming down. When you aren't float loading, you may be having a right hip collision (roundhouse).
As the pics above show - keep your pull moving down to the plane line, and chances are good you'll clear the right hip nicely.
Key on the feel of the shoulders being closed (right shoulder back) until your hands pass your chin. you won't get there, but that 'feel' can help
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Float Loading has the Right Elbow bend increasing (Magic) .......so maybe that is the source of the bounce over the plane? Hard to say.
Or maybe there is some minor under plane Hand Motion say, then a little "equal and opposite" over plane bounce in transition. I can sometimes get just slightly laid off at End after some Horizontal Left Hand motion, a slight arch to the left Hand, then a bounce back over the plane in transition. Float Loading will cure it for me too, but only because I need to fix the left hand wrist cocking plane (vertical motion only no horizontal) to be able to Float Load in the first place. The arch just doesnt want to cock for me, I need a slightly bent left hand. Which is consistent with my grip type and a pure vertical left hand wrist cock plane of motion. Geometrically flat but actually bent.
As an aside, Ive always been a little confused by Homers division of Drive , Drag and Float Loading. Homer had Float Loading labeled as "Hit or Swing" but Im wondering if its possible to be Three Accumulator Hitter and Float Load? It sure feels like Drag Loading but with a later loading to me! Arrow from quiver, longitudinal acceleration, loading the #3pp at the knuckle as opposed to the first joint, the pivot pulling the Hands down plane with a strong sense of a tug at the #2pp...........It goes nicely with a Shoulder Throw. Super nicely with a Lagging Takeaway.
Four Accumulator Hitting and Float Loading I can see but is it possible to Float and then thrust, Three Accumulator Hit? Wouldnt that have the Right Shoulder hanging back while the Right Elbow bends and Loads in Startdown, then a Drive Out. I can imagine it but it seems kinda weird to me. Maybe I got things all mixed up again.