Here’s a reply I posted on a related, but different thread.
I have to admit it, but I “cheat” for my FF’s and they become not so bad.
Cheating isn’t quite right, but it’s doing something that helps my head.
Since a FF is done in level mode - not ERG - I do a my FF’s while also doing a big Zwift race (e.g. a race/ride with several hundred participants). I time the start of the 5 min MAP test on FF to be at the exact same time as the start of Zwift race. In other words I start my FF exactly 20 minutes 23 seconds before the start of the Zwift race. This lets me use the first ~20 minutes of the FF as a warmup for the Zwift race. The Zwift race starts and I’m off racing AND doing my 5 min MAP test at the exact same time. This will usually put me in the front group of the race, often off the front on my own. When the 5 min test is over, I drift back in the pack, but because I’m doing this in a big event, when the 20 min FTP test starts (5 min after the MAP test), there are still lots of people around me and I can use them as carrots to see how many I can catch during the 20 min of hell.
To do the above, I run SYSTM and Zwift simultaneously on my laptop. SYSTM is configured to record my HR, cadence and power and also set it up as the Trainer Control. Once I start the FF, I switch the workout mode from ERG to Level Mode (level 2 works for me, you might have to experiment to see what level works best for you). I then setup Zwift to read power, HR and cadence, but NOT control the trainer. I use an ANT+ dongle for the SYSTM connections and BT for the Zwift connections. I’m sure there are other setups that would work, but this is how I’ve got it working.