If your masking tape is lifting the underlying paint, it may be a surface prep issue.
When painting with acrylics, for good paint adhesion, a clean surface is the key. It needs to be absolutely spotless and free of any oils and contaminants from the building process (eg. sanding dust) or from your hands before laying down your base coat.
Wash in warm soapy water, rinse and allow to dry, or wipe down with isopropyl alcohol, and handle the bare plastic as little as possible before painting.
Now having said that, I'll second the suggestion for Tamiya paint - yes, it's a little more expensive, but it works great and is very low-tack.
You can use the tape over both gloss and flat finishes, it shouldn't be a problem.