I use a lot of cotton like poly-linen (textured) and upping the gamma in the art and using the highest quality setting on the printer improves this substantially. You will not get that glossy photo look but you can achieve matte photo quality.90 seconds does seem excessive. 60 is average at that temperature.
What don't you like about it? The color not popping? You will get better color reproduction using a non-cotton feeling polyester. Try a smooth silky interlock poly instead.