As noted by many - a carb that is seemingly undersized is prefferable for most model use.
Unless one is running WOT all the time , the bigger carbs can be a real problem for trying to get smooth power band -and I am not talking "torque". Just getting a good blend of low to high needle transition under prop load suited to the engine
The BME 115 appeared to me to have an oversized carb which did not have sufficient flow to draw thru HS needle .
I did not use their engines so it the question was merely of casual interest.
However - using tuned exhausts and rotary valve engines and propping for max power , I found that a smaller carb ,operating at higher vacuum (most flow into engine) is a better overall setup.
In switching carb types n sizes on a 50cc setup, I saw that once the DEMAND of the engine was maximized, larger carbs simply added nothing to performance.
A well tuned pipe setup maximizes mixture flow -that's where the power comes from
We saw the same thing 50 years ago ,running small block Chev's.
We ran faster than the competition using 3 Stromberg 48 carbs as opposed to the then popular dual four barrels setups
In driving watching etc., it was obvious we had more power in lower rpm and no flat spots . At full throttle the dual 4's did put out more but overall we had more tractable, usable power.
Our models only need a carb which puts out max power BUT- transition from low speed has to be usable.