Listen to Step Turn
I have 25,000+ hours on many things including Chipmunks, JP's, Gnats, Hunters, Whirlwinds, Harriers, Lightnings, Jaguars, 737's and all models of 747's - oh and PA28's.
Everything we did had "margins". Unless you really need to fly in and out of a VERY limiting strip with VERY FEW "margins", I suggest that you don't.
Old and Not too Bold