Putting the tape on the bag instead of the mold is a great idea. I'll try this next time. How do you handle multiple vacuum ports for large parts? If there is more than say ten feet between the port and the far end of the bag, the vacuum at the far end can be too weak. I usually put a 1/2 inch PVC pipe inside the bag with 1/4 inch holes drilled every six inches or so. I seal the pipe in a pleat in the bagging film at the edge of the mold. To prevent any distortion of the part, I tape strips of 1/8 inch plywood about 2 inches wide along the length of the pipe. The pipe with the plywood taped to the bottom is outside the peel ply but inside the breather layer. Seems to work pretty well on hull sides and spar layups.