One more thing. Now that this atty is tainted with burnt fibers, will it ever clear itself up? Will cleaning it with alcohol fix it, or is it shot?
Check the top of your cartridge (black edge) and see if it's melted a bit. And depending on if you just got your 510, you can get a nasty taste from the shipping fluid that is on the atomizer that keeps it from drying out. You can either soak the atomizer in alcohol like clear vodka for a 1/2 hour then blow it out both ends and that tends to lessen or does away with the nasty taste or you can vape it out by not inhaling until it goes away.
If it's not the shipping fluid, again check the cartridge top to see if that is melted. If the atomizer bridge is not centered it could be contacting the cart edge. You can take a toothpick and 'nudge' it toward the center but don't 'crank' on it. Usually when this happens (rarely) the metal mesh has moved off it's base a bit and a gentle pushing of it back in place can stop it from touching the top edge of the cart.
If there are hairs of the filler that is stuck to the atomizer you could pull them out with tweezers BUT these are the fine hairs of the filler not the more coarser threads of a material that is part of the bridge (the protrusion with the metal mesh in your atomizer) don't pull that material out.
Pyramid Tea Bag material is the same stuff that is the oem filler in the cart and while it is not as likely to get stuck on the bridge, it is still possible for it to come in contact with it and super heat it. I think it you're getting a 'plastic' taste it is most likely the bridge in contact with the top of the cartridge. If you're just getting a nasty taste it is likely the shipping fluid or you are out of juice and
vaping air.