RE: Just another Dumb smoke question...
Hoss,
Can you get your injectors bent in more toward the center of the tailcone?
Do you have a lot of space around the outside of the turbine? Ie. is a lot of your inlet air bypassing the turbine? It may be that in the ground there is very little air moving through the tail so the injected oil gets right not the turbine hot exhaust, but as more air is rushing around the outside its not letting as much of the oil inject into the hot exhaust.