CADer, do you have a screen protector on your iPad? I'm just wondering as that might interfere.
Also, the noted degradation of performance when moving slowly may be due to charge building up on the surface of the screen. Fine point styli use cascading voltage multipliers to enlarge the area of capacitance disruption in the touch sensor, thus simulating a larger tip. A charge buildup will distort the spot the touch sensor detects, which causes the calculated center to wander. A redesign of the stylus may be necessary to remove this effect in general, though one may be able to mitigate it by experimenting with screen coatings or screen protectors that dissipate the charge at different rates. Another possibility would be to add a grounding ring closer to the end of the stylus tip which would help shape the electric field. Just some food for thought.
Anyway, I backed the TruGlide Apex and have yet to receive mine. Can't wait to give it a go!