One of the things that SE promoted with this game was that controller play would work well. They made a big deal about how they'd really thought upon a solution for the limited real estate. Crossbars work well, but there needs to be more. 16 is simply not enough.

Their "system" can't be faltering 2 weeks in, they need to design a solution.

Alternatively, they could implement a third crossbar that's invoked by holding both triggers at the same time. Either would be better.