OK guys, I had time today to spend some time on tuning the car. I ended up changing my approach. I tweaked the RT base map in the low RPM range to tune out the jerky throttle behavior in rolling situations and I smoothed out the map altogether. I also rescaled the RT map and modified the values accordingly to dial in the appropriate boost targets. I reverted the ratio map back to stock values.
The result is a MUCH smoother car overall and very good mid range response without the off throttle bucking that I hated in the stock tune. To be fair, I think the stock AVCS map also contributes to the low RPM bogging that the STI has a tendency to do along with a very jerky behavior. By modifying the DBW tables, I was able to rid the car of most of this. The rest will come from altering the AVCS tables.
The tables are as follows (entire stage 1 tune is still in progress):