I think since your engine has cam profiling the dip is normal. That kinda power on a stock NA engine is pretty healthy. Looks like you did a good job overhauling. Whats next on the engine list?I tried two dyno, both dynoject.
One from Mpower, got 160 whp with worn engine after tuned.
After overhaul, when to D4 racing, first run without tuning I got 165 whp. Which means i gain 5 hp after overhauling my engine, which is logical. Finally after tune on the second dyno, the results are 180 whp.
Also a myvi 1.5L got 80 whp, factory rating 102 hp at the D4 racing dynojet.
So i think dynojet is quite accurate at the least.