I gave up trying to perf cut on anything with a cutting strip. Got a Graphtec which has the groove for cutting and have not looked back. I really don't know why other manufacturers don't have this ingenious system. In fact, I have never used the cutting strip on my Graphtec and leave it on the groove for everything including kiss cutting. My combo is now a BN20 + FC9000-750 and its perfect for my small shop which produces promo items mostly for my own business - although I could easily take on small runs for others. Keeping the printing and cutting separate also lets me leave the print to outgas for a few hours - a step I found essential especially on prints with a lot of black. They curled pretty badly if cutting straight after or close to the ink. Or you could print, outgas, laminate and then cut while leaving your BN20 doing what it should be doing mostly - printing.
As an aside, not sure why a good few people on this forum bash the BN20, its a great little beginner/small run machine and gives amazing quality prints, albeit slower than others. Also the footprint can't be beaten for a small shop in terms of quality/sq foot. Getting the right roll length is not all that hard, most suppliers will cut it for you and if not, I just measure the lengths I want, put masking tape over and cut the roll carefully using a miter saw (cut half then rotate 90 and cut other half). Then just get rid of all the dust and sticky bits with a vacuum, wipe and finally use a Swiffer.