And you used SAE smoothing to boot. Change that up to STD and I'd venture to guess your Dynojet number would be even higher. Heck, change it to Smoothing 0 STD for even bigger numbers.
FWIW, I did 333whp on a DD and 424whp on a Dynojet back when I had my 135i 6MT. Different days, different temps, but yes, DD's are definitely heartbreakers.