Hi, Piper's May 2012 revision to the POH says that you should recover by 4000ft. If you are slow flying, and a stall/spin is likely, that means that you should add a further 1500ft. i.e. start the manoeuvre above 5500ft.
The implication is that any slow flight below 5500ft is dangerous in a Tomahawk, which makes landing it a bit difficult.
I had an encounter with a vortex from the A380 building at Hawarden, whilst John was instructing, I lost about 100ft of the 150ft whilst crossing the fence on final.... We were both lucky that day.