1cell 13.5 and 2cell 21.5 are very evenly matched so both would be allowed depending on what you currently have it wouldn't be one or the other.
I see the theory in having 17.5 2cell but then you could allow 1cell 10.5 as that would be a match for 17.5 2cell and as a lot of people hav 10.5 it would make sence. But everything would have to be blinky or the speed difference opens again
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