Do you have the correct media type?
I've been testing glossy canvases lately. On Exhibition Canvas Gloss I definitely get stronger blacks with the photo black ink, versus matte black. But that's on an 8300. Looking at the inkload tests for both matte and photo black I don't see much difference in the specular reflections, although after more than a week the matte test still smears slightly with rubbing whereas the photo black does not.
But as you mentioned the pebbly, bumpy texture is a little over the top for general use. I assume the Satin texture is similar to the Gloss. That's really too bad, IMHO. The gamut and dynamic range of Exhibition Canvas Gloss is pretty spectacular and it invites use outside the wedding and portraiture areas where pebbly is acceptable.
You might also want to take a look at the "new improved" BC Crystalline canvas. It's very punchy stuff. There is some surface texture, but it is much smoother than you see on ECG, and you do not get the sense of seeing a zillion little stars when you view it under hard lighting. I recently put a test print up against some Peter Lik facemount prints in bright spotlight illumination. It easily competed with Peter's best efforts where he had shown no mercy on the saturation and contrast sliders. It was hard to believe it was canvas.
A thin coat of GlamourII over Crystalline takes it from high gloss to something a little on the matte side of satin, and a thick coat takes it down to about satin. But it's spray-on only, GlamourII acts like a solvent and I'm certain rolling would be an instant disaster. If you apply coating over a local touch up, you have to be careful not to drag the brush, unless the print has been coated.
Am currently printing for two shows in June. Just started the 5th, 44 inch roll of Crystalline and have lost only one print to surface defects, and that was a small patch of high spots that got planed off by the heads. Other than that maybe 1 or 2 very small flaked off spots per roll that were easily fixed with pencils and markers. Am very gratified that there have been no varicose vein weave errors or wart bumps, which make me crazy. Generally the cleanest canvas I have used so far.