@harrierpilot222 see my post “A better (for me) ramp test”. Use my HA Hybrid ramp test. You will get a result that more closely matches your SufferFest 4DP test results. The 5 minute effort previous to the ramp more closely mimics what you do in the 4DP test.
This methodology is recommended by Hunter Allen. See my post for more details.
If I set my FTP according to my HA Hybrid Ramp Test I can hold that power for an hour. If I set my FTP according to just a regular TR Ramptest I can’t come close to holding that power for an hour. Many riders have this same problem.