Bill,
With the new plane, I'm using Dee Rice's method. Slap down 3 or 4 layers of electrical tape on some glass, cut 1/4" strips at an angle to give some overhang, the lay that down (ith the overhang on top leaving the lower layers away from the ink tip) to use as a guide for inking. Works pretty well if you are careful.
On the 3M tape: I've learned not to use it on tight (even mildly tight) corners. I use frisket, some sheet adhesive vinyl I have or electrical tape and cut it out to the shape of the curve. It just solves the problem and I don't have to worry about the crummy 3M tape pulling away. As I noted, I suspect that this is an age issue. The sticky side just isn't that sticky anymore. I'll try to find another source for the stuff and try again at some point, but for now, the current method seems to be working out OK.