laser transfers can be tricky..the Oki is a fine printer to use...it will take some testing to dial in your printer/paper/heat press. A forum member, Luis ( Lnfortun) a forum member is an expert I think with the oki lasers...see this post where he has a pdf with tips:
http://www.t-shirtforums.com/heat-press-heat-transfers/t341145.html
http://www.t-shirtforums.com/heat-press-heat-transfers/t341145.html