I duct tape over the tapes on my diaper everyday, if you don't they slip and cause leaks, since I started doing that I have less leak problems.
And yes the 3M tape works much better, but if you push down good on the cheapo tape after you get it in place, just go back and forth a few times pushing it down then it stays where you put it.
I was only doing the bottom tapes, because they gave me the most slipage, but for the hell of it started doing the tops, and the diaper doesn't slip down when wet, so I do all the tapes now for 5 bucks for a big roll it's cheap insurance.