It's just the raw results. Another promising idea may be to react mirror images of the new engine against each other. Here are two more clean puffers based on the new engine. These were found by enumerating reactions of spaceships and dirty puffers composed of the engine and another spaceship. Anyway, here is a period 16 rake using Tim Coe's engine.
Gliders propagate backward with respect to rake propagation.
I haven't found a forward rake, but the enumeration is still going, and I'll post if one shows up. I went over all the different puffers that came up in the enumeration and selected those that seemed well-behaved. Besides p16 puffers, there are p32 puffers for blocks and tubs, and a p48 blinker puffer. Two had what seemed to be interesting sparks. I tried adding another spaceship and managed to stabilize the exhaust down to a block, but not eliminate it entirely.