IMO, just about any full synthetic is better then the T-IV.
I flushed a few to the D4. Toyotas shift a little 'better' with it. But, some may still want a smoother shift.
Only use it if Lubegard/Smartblend are available. You might need a couple ounces of the HFM to keep yourself happy.
With any ATF flush, consider resetting the TCM. It could be as easy as leaving the battery disconnected overnight(recommend to all), but some vehicles will need a scanner to erase 'learned habits'.