I have been making my own Hot Sauces for 6-8 yrs now. the one thing I stress is you cant taste the sauce right away. If you let the sauce sit a few days after bottled it will taste completely different. This heavy Chinense taste you keep commenting about is common after just cooking. It will or should die down after a few days and then you should have a nice smooth and mellow tasting sauce.
I am no expert but this is just what I have found over the years.
cheers and good luck!