Since you have the base game playtested, I highly recommend posting a PnP (or demo version) of the game as well as ruleset on BoardGameGeek if you haven't done so already! (:
Also, contact reviewers with the PnP, and, in return, provide them with a copy of the final game. Not sure which Cthulhu card games are most popular, but I guess you can browse the Arkham Horror reviews on BGG, PM some reviewers, and ask them if they'd be interested? Myself, I've written various RPG reviews on DriveThruRPG and would be interested. Since these are storytelling cards, I think I can write up some simple variant games based on Atlas' Games Once Upon A Time and the Baron Munshausen RPG as freebies to add to the backer updates. You can also pitch them as RPG aids, similar to the Pathfinder NPC cards. (For monsters, the GM selects a card and describes the monster, without revealing the picture to the players!)
A friend of mine is an HPL fan and has successfully published an anime RPG as a KS and I can put you in touch with him. Not sure how much he can help, but never hurts to ask!
Good luck!