Whatever matte paper you choose, you may need to add a bit of extra punch in either mid-tone contrast or colour (or both). Also, work at achieving your deepest blacks - either a custom profile or special curves may help. Shadow separation can require special attention, too. Lastly, never put the matte print next to a lustre print - they are two different beasts, and the comparison won't flatter the matte print. Done right, matte prints have their own beauty - not least in the lack of sheen that, in real-world viewing, can outweigh the nominal benefits of the lustre print.