Do you have the needle settings on the engine right? It sounds like its too lean and starving for fuel when you give it throttle.On the glow plug...if you flooded it a couple times and have left the ignitor on for a long time, its probably a good idea to get a new glow plug.
If you're holding it up in the air,and holding a radio,then its pretty hard to tune the engine....I would prop it up on somethin close to the ground so you can make adjustments on it.Is there maybe a little bit of fuel and smoke coming out of the pipe while its runnin?It should be rich enough to be spittin a little bit of fuel for the first few tanks and you really shouldn't go over 1/3 throttle on those tanks either.....I'd actually drive it too but resist gettin on it;Its not too good for the drivetrain to spin the wheels with no resistance.
On your plastic shavings...Is this the SS? Did you build the truck? If so,where on the truck have you seen that material?Look over the truck real slow and carefully...turn the wheels real slow and watch everything and see if you can find anything.