if you're not absolutely set on 3m, I'd suggest Avery mpi1105ezrs... I think it's better than 3m's 180 line in every single way personally, but it obviously sounds like you're stuck to 3m for whatever reason. The CV3 will have less visible air channels, but under scrutiny they are still visible. You say you're using it for "decals", which has me thinking you don't do much wraps, in which case the 180 line is really overkill and you might want to check out their lower end items like 40c or 35c (big step down, but much more affordable) or their 175 series (not as much of a step down, a little less forgivable on install skill though). Let me know if you're at all open to things other than 3m and I have more suggestions. My undestanding of 280 is that it's just like 180, just a little less aggressive (I suspect this is an attempt at competing with Avery's mpi1105ezrs which is less aggressive than the 180).