Wow... I just got back to this post and was wondering if I'd gotten any kind of response. Apparently I did.
Thanks lagdonk- this looks like really good advice.
I think the biggest thing holding me back (I only have a marginally positive ROI at HU SNG's- I'm sure the 10% rake isn't helping) is my preflop play. I play well enough post flop from being a winning 6max cash player.
I'll take your suggestions and work them. We'll see how it goes.