I’m assuming 'Floating' Banker means e.g. Tri B-F-F; F-B-F; F-F-B; Exacta B-F; F-B etc
Can be a lot to invest especially if big fields or more that 1 FB!
Assuming you have a pretty good strike rate with your FB/s might be better in the long run to perhaps restrict your FB/s to 1st & 2nd posi thus reducing your investment each time by 1/3.
Just a thought!