Digital BW, The Print

Hi there

I am fairly new to B&W printing and have a question for you experts.

I recently bought an Epson 1160, already wired up with MIS quadtone 
inks. After some playing around with Epson matt paper I discovered 
Lyson Standard Fine Art paper.

The results are superb. Now my question: The paper is quite thick 
(310 g), does that do any harm to the printer? I know there is a 
lever that you can put to '+', but then the dots become streaks, when 
viewed under a lupe, so I would prefer the 'normal' position. The 
printer seems to handle it quite well, but I don't want to harm the 
transport mechanism, or the print head.

Regards and thank you
Hans