Downshifting pointers needed

[Pocket]

Now that I have my upshift points and torque converter lockup points set how I like them (this thing is shifting like a dream ), I'm looking at some downshifting changes.

Some background... My old tunes had two settings with downshifting (daily driver and tow setting). As my truck slowed, the trans would downshift from 4th into 3rd. This came in handy in the mountains, especially when towing a load. The only issue I had with the downshifting was the torque converter remained locked as it downshifted, often resulting in a very jarring and harsh downshift (also heard it wasn't good for the transmission).

So my question, can I tune a 4-3 downshift that unlocks the torque converter, then locks it back up for a smoother downshift?