I can hear you are unhappy with the sound of the T8S.
Please say more about what aspect of the sound is disappointing.
There are several differences between the T1 and T8S. A big one is the reverb. We used a new reverb engine in the T4S/T8S. One reason for this is: the T1 is mono and the T4S/T8S is stereo.
The way the time parameter is expressed in the T4S/T8S (percentage) is different from the T1 (milliseconds). As a result, there is no direct mapping of the settings from the T1 onto the T4S/T8S. Please see the full details of how the time setting affects the reverb here:
T4S/T8S Reverb Settings
When I got my T1, I set my reverb by ear making changes to suit the situation. Because the reverb in the T4S/T8S is based on a different engine, we encourage people to do what they do with any new effect. Set it up by ear rather than trying to match settings.