...and my carb's float is set dictated by the angle at which the carb is mounted - in my case so extreme as to limit any adjustable range there may have been were it mounted level, unfortunately this also means I can't experiment with your suggestion.

I have noticed how few level types we have around these parts

I'm not 100% sure how much an effect the "regulation" of fuel into the bowl would actually have beyond restricting it to the point of starvation. The only way I can see it having any effect is the extremes - literally pouring into the carb or simply not filling the bowl enough and cutting out.

The air comes from the throat after all, fuel should be atomizing as it comes out of the jet and not before - so how would float level effect mix if it's the needle that regulates this fuel stream? Where's the "air" coming from? I just don't see the float as being precise enough to regulate anything anyway as it bounces and sloshes around in there at speed beyond plugging and opening...

I could be wrong, gawd it's happened enough before lol But based on all my tinkering I've never considered the float as a viable means to adjust mix beyond "zomg its pouring out all o'er the floor" or high rpm starvation.

edit: I have never suggested drilling or rejetting, viable as they are - I have only referred people to setting the Eclip to adjust mix, dictated by plug coloration. Rejetting is way too regional (altitude) and thus precise to recommend specific sizes remotely, particularly when relying on a description alone heh