I've found out a little more - and made corrections to my posts above.
First - the Reverb engine in the T4S/T8S is new and improved from the T1®.
As a result, there is no direct mapping from the T1® settings to the T4S/T8S.
Here is how the percentages are applied to each type of reverb.
So your Medium 1.7 seconds on the T1® becomes
Medium 90% (1.7/1.9 = 90%) on the T8S.
Try turning up the Mix to 50% and experimenting with the Brightness.