Amateur or pro? Back when I was fighting (amateur), you were only allowed 2.5 meters, while pros could use 4 something. I had bad hands, though, so my trainers and I decided that 4-5 meters should be the allowed length for me. Helped save my hands and make me feel more like a total rebel. Never got caught for it, but nobody really gave a toss about anything back then. It wasn't as if the officials didn't notice - then just didn't care.
Anyway, 4.5 should do the trick. That's only a 10% difference after all. Use some extra tape if you must (when you can...).