Switch to BMS!
Myself beeing a great fan of AF, tried freefalcon never got open falcon to work, got hooked on BMS.
Easy to install, just find the Falcon4 .exe on the web, and you are good to go!
If you insist on flying AF, try the HUD only view. Then you are able to see the fpm also when lánding. Don't remember the keypress, it,s been a while since I fooled around with AF.