Well it sounds like you have it burning pretty good. It almost make me wish I had the guts to modify the ash door when I had my 190. I didn't know about this great site back then, now that I think about it, I don't think it existed yet when I had my 190. I remember calling Brunco up on the phone and having a very long detailed discussion about doing what you have just done and Brunco didn't want me to do it, it would void my warranty, it wasn't tested that way, we don't recommend it, if it was going to improve our product we would have put it there, etc.
I'm happy for you and glad it is working as well as I thought it would. Do you think that you could post some pictures? We all love pictures here and I'm sure it will help someone else with doing an improvement to their Brunco furnace.