These machines arent really designed for paper... Not saying it wont work, but blueprints are generally printed on a "Plotter" / Aqueous printer - Much faster, Theyre way cheaper... and more accurate. My resin has been pretty bang on accurate, but I dont know if it would be for stuff like blueprints. Even on our Latex we never had great success with paper, we could make it work... but like you there would always eventually be tunneling, especially on the non latex specific paper.
EPSON C12C937271 SC-R5070/LMEDIA SPACER - Look into one of these... I believe it was $200ish? It's supposed to be for heat sensitive medias, I havent used mine yet so I dont know if / how well it works... but I've heard a few people who use cheaper medias use it, and it helps a lot