Digital BW, The Print

I finally received all the parts from MIS and two paper sample packs,put it
all together and started printing,with an Epson 980,MIS VM-Quads and Paul's
curves for the 1160,which seems to be the best matching. When printing to
EAM it\ufffds ok,to other papers,more or less,what is no surprise. Some questions
arose:

1. Even in EAM,using neutral curves,though I have a good screen-print
match,it lacks a little snap,a little contrast. Any kind of Paul's curve
tweeking could improve it?

2. Paul's definitions include sRGB color space.Why not Adobe RGB,that has a
wider gamut?

3. I like EAM for matte paper,but  which could be the better choice for a
paper that resembles RC photographic paper. Glossy seems to shinning... The
closest that was in the sample packs was Generation Pro PhotoLustre,but it
still have a texture that may "harm" some images. Any hints? I also care
about archival qualities.

Andr\ufffd.

> 2. Paul's definitions include sRGB color space.Why not Adobe
RGB,that has a
> wider gamut?

Why does gamut matter in black and white? I don't get it.

(Not intended as a criticism, but an honest question, I don't
understand and I would like to :) )

Thanks all for the tips,I'll try the tips and see where I get!
Andr\ufffd