Painting now on Stretchers

So, I bought some 30″ gallery stretchers, and mounted the test painting (I should call it a ‘study’). Looks good, though, I’m wondering if I should paint to within 1.5″ of the edge instead of 3″. With the 3″ border, it’s more likely to stretch without cracking, but it also looks more unfinished. It’s OK, if I point out what I’m doing and how it got this way, but it’s possible that someone may judge it rather critically because of this.