You can use a retraction test from Thingiverse to set your retraction.
https://www.thingiverse.com/thing:909901
Print it with 0 retraction then add retraction 0.5mm or 0.1mm per print until stringing is under control. You should be able to get by with 1mm or less, in my experience.
What is a pretty cool ambient temp for you? Keeping the room at 75F or lower will help reduce heat creep jams.
You could also try reducing the hotend temp. That filament probably doesn't need 228C. Try 205.
What layer thickness are you printing? If it is really thin, try the same part at the thickest layer you can print with your nozzle and see if jamming is reduced. The general max layer thickness for a nozzle is around 80% of the nozzle diameter. This moves plastic through the nozzle at a higher rate. That reduces the heat creep problem because the plastic has a shorter dwell time in the hotend and doesn't heat and expand as much in the heat brake.
If you are still running the tiny blower hotend fan, upgrade to something larger. There are solutions on Thingiverse.
I asked about the hotend temp because some part cooling fan setups can over-cool the hotend when they kick on. If you temp is staying within a few degrees of the set temp throughout the print, you should be ok there. I doubt you have a thermistor problem.