I purchased FMF graphics recently and they do not have holes punched in them. This prevents gas vapor from escaping leading to bubbles. Most graphics do have holes but FMF do not so if the bike sits for a week you have to drain the gas and leave the cap off.
The fuel vapors will permeate the plastic tank and start building up under the stickers. That is why most
tank graphics have the "breather" holes in them. Try a using a needle and pierce each bubble as they
happen, this could take time but eventually you will do some good and you really don't see them too much
either. Just an idea.
The reason why most aftermarket graphics don't stick to the tanks very long is because unlike the stock ones they dont get to be stuck on a tank for 3 months sitting in a warehouse without gas ever being in it. Some companies use the holes some don't, they all last about the same time though, usually not long enough.