I'm assuming you brushed on the paint. With any masking medium if you apply a very thick coat of paint, where the paint transitions over the edge of the mask the paint could be thick enough to have a fair amount of strength. When the mask is removed the paint will not tear along the mask line but will tear somewhere where the paint is thinner and weaker. Some will tell you to use a new, sharp blade and score the paint along the mask line before removing the tape. Personally, I don't like the cut line that this sometimes leaves but it is very effective.
My suggestion would be to remove the mask media as soon as possible after the paint is applied. This way the paint is still liquid and will not have strength to pull or crack. As far as the bleed through on tape seams the best way to battle this is to use a tool to burnish the edges of the tape where they overlap.
Finally, be sure your surface prep is good. Make sure the surface receiving the paint is clean and oil free, no finger prints and such. Anything like this on the surface and the paint will not adhere well and be much more likely to lift or tear when the mask is removed.