Digital BW, The Print

I have previosuly used my R2400 with K3 inks on matte papers with good 
results. I recently ordered some of the new fiber papers and I am 
having a few problems. I am cutting 8.5" x 11" sheets into 3 pieces 
(4.25' x 8.5" (1) and 4.25" x 6.75" (2)) so that I can print three 4" x 
6" test prints.

I have three questions:

1)On the far right inch or so of the prints, there are faint vertical 
lines and the ink density is slightly fainter. I watched it print with 
the lid up and it seems to start where the paper comes out of the rear 
rollers and it advances using the front rollers only. I used to have 
this problem with my R300 when printing on snall sheets or two near the 
front or rear margin.

2) The prints have a line of spaced pock marks along the left side, as 
if it was punctured by a sharp roller. I have heard of pizza wheel 
marks before and was wondering whether this is what they are, and, if 
so, how to get rid of them?

3) Do I need to a print head alignment each time I switch to a paper of 
a different thickness? Would adjusting the paper height setting help 
things?

Other than these problems, I love the look of the prints. I have not 
tested the papers to any extent yet and I can only offer first 
impressions. The surface of the HM Baryta reflects the light more than 
the Epson and also seems to have a slightly mroe textured surface. Both 
are fairly similar in warmth. I have not compared versus Harmon gloss. 
They both open up shadow detail and appear sharper than prints made on 
VFA.

Thanks for your help.

Paul G.