So, I've hit a fundamental limit with the way this design is built. Because I'm adding a single fire atom last, I've put it in a place in the design where there is a minor lull in how fast I can move the whole thing around. This isn't a bad thing - on the contrary it helps the whole engine reach max rate quite nicely, but for the 5th and 6th products, it is the last output drawn. This means that I have to wait for it on the 6th product, and this wait means that it *must* be output on cycle 36ish. Unfortunately the 5th product is also output on the 36th cycle.

It - as far as I can tell - is a fundamental cycle limit to this design.