So far, taking the stock tune, I have multiplied my force motor table by 0.90 (slightly firmer shifts) and multiplied my normal shift time table by 0.40.
In order to smooth out the low-throttle shifting, I had to manually update the 1->2 shift row, but I wanted to maintain the stock curve. I settled on a progressive adjustment... Starting on the left, I multiplied the first field by 0.68, the next field by 0.70, and so on, so I ended up multiplying by 1.00 on the last field. This gave me a starting point of 7.9. Originally my low-throttle shift was happening at around 18mph, but now should be closer to 12mph. As I play with it more, I may adjust the curve so that a heavier throttle holds off shifting longer.
Additionally, I modified the 3->4 shift row to a higher RPM. It seems rather silly to be shifting into OD at all while driving around town, but I had to find a balance where a low-throttle acceleration didn't cause the same hard shift as we're seeing in the 1->2. I applied another progressive multiplication to this row, so now it starts out at 38.6, and I am rarely seeing OD in town now.
I have not played with the downshifting at all yet, but there are some very strange values in the stock table at the end of both the 3->4 shift and the 4->3 shift... Why are the last several columns maxed out instead of having smooth numbers applied? And looking over the values I have now, I need to make suitable adjustments to the downshifts to stay well under the upshift points.