Model 19 EQ and 806/802G HF
It sounds like your doing almost the same thing as I am in the way of EQ with the 19's and with the same results but I'm using my Mac C-22 preamp for the EQ.
I have the bass trim pots turned up not quite halfway to give some boost under 100HZ only and I'm using one detent click of HF boost that represents about 4db of boost at 20KHZ but the slope going up to 20KHZ is very gentle so the mids aren't dragged up too much as a result.
I have the bass controls set to flat because I find at one detent click or about 4db of boost is a bit too much for me and that the bass trim pots work out better.
There was a very long thread, maybe in another forum, about adding tweeters and the high frequency response of the 806 and 802G drivers.
If I remember correctly the graph of the 806 driver showed that it starts to drop off around 9KHZ so it would need more of a HF boost to sound like the 802G with the compensating network.
I do find the bass on the 19's to be way better than I got from the Flamencos for whatever reason.