Ufda...it's frustrating when you are stuck with the HR types...best thing you can do is try to spin your experience to their knowledge level, maybe un-techno the language, get the concept that I can do A, B and C across with minimum of description, that kind of thing...once you get to the actual department manager the detail and lingo will make sense to them...HR types are merely first level screeners and not very good at that especially in any kind of detailed professional or technical function...
On the plus side often times it is easier to bamboozle those types with buzzwords and other catch-phrases they are clued into...paradim, change agent, facilitator...stuff like that...
Unleash the babble on the HR clown and unleash the experience on the hiring manager...that's what I learned anyway. Overall I've been able to size people up pretty quickly, certain questions they ask (scripted or not) indicate who you are dealing with, as is their interest in interviewing you, how attentive they are to your responses.
Oh, another thing is to not ramble...I used the term babble above but in reference to content not volume...often times letting silence take its course is difficult for people to deal with, they feel like they have to say something...anything...like the next utterance will be the deal clincher that moves them on or secures the spot. Firm, confident concise answer and sitting comfortably in silence while you await the next exchange is a valuable skill to develop.
Hope things break for the better soon, LV!