with 65% poly, you are likely to get a faded look to your graphic. The inks only adhere well to natural fibers such as cotton, so printing with that high a content will probably not give you a great result. There are supposed to be some new inks made for poly, but I have yet to hear much about them. I think anajet is offering one, but it comes in carts, so would not really work great for the HM1. I have not really heard so far whether it works.
But I have an HM1 and I myself would not print on that high of poly content The result would not be favorable.
From my experience print on poly blends always looks too muted for my liking. The 90/10 are ok due to the majority cotton content. Try it, it might look ok for what you want; however, I think it is best to stick with the 100% cotton.
I agree with Don. Just try it. I have had some good results with certain things and colors. I have the best results when I let the item sit for 5 mins. in between ink coats. No problem with the washings. It will depend on the item. All you can do is try item by item.
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