I’m in PE age. Currently have 13 TF in my city producing fp. I’m in a place where I’m fast leveling my GBs now. I was as high as 16 TFs but removed 3 and put down an HS and a HC. The HS now produces 40 fp a day and the HC is at level 35 and leveling 1 time a day. I will remove 1 more TF and put down the Crows Nest very soon. The TFs helped me a lot, but if I can find a better building to put in their place I will and I am. My city produces 440 fp per day now and I’m looking to do better.