Tacx Fortius Multiplayer T1932 Powercurve (sudden rise of resistence to 13)

[WouterJD]

Being a late joiner in 2019 I'm now connecting my Tacx Fortius.

I'm looking in file "power_calc_factors_fortius.txt" but appear not to understand it.
Who has a description what this file exactly does.

Reason to ask is:

• When using Trainerroad, things work pretty well.
• When TR requires 200Watts, but I drop cadence (because of distraction or fatique) the resistence goes op to 13. Low speed requires high resistence to achieve 200W, so I understand the reaction, but when dropping cadence inadvertently, a great rise in resistence makes it impossible to get back into rythm.
• When I do a full stop (cadence 0), resistence goes back to 0 as well and then I can restart.

How to avoid sudden rise of resistence to 13?

[WouterJD]

Refer to https://zwiftinsider.com/erg-mode-in-zwift/ explaining THE SPIRAL OF DEATH

(ERG = from Ergo = Work)

If you understand how ERG mode works, you’ll understand what we like to call the “Spiral of Death”. This torturous event happens when you are in ERG mode attempting to hold a particular wattage, then your legs get tired and your cadence slows. In order to keep hitting the wattage target, your trainer will then increase the resistance (see examples above). This increases resistance means your cadence will slow even more, which means the trainer will pile on more resistance… until you feel like you’re pedaling through wet cement.