Dude, do you realize how hard that request is? There's barely any 05-08 romance stuff I've seen that you haven't.
How about Lamune? It's too relaxed to compete with stuff like EF or Hanbun no Tsuki on the drama front but I'd regard it as a high quality VN adaptation.
I'd like to recommend the rest of Mahoraba:Heartful Days but you've seen seven episodes and I doubt the rest would change your mind. I do recall Shuffle getting better after the point you dropped but I'm hesitant to truly recommend it.
Aside from Lamune, I feel like you should give some "shoujo-tinged seinen" like Otome Youkai Zakuro (2010) and Inu x Boku SS (2012) a shot. Just be aware Inu x Boku SS is basically ten episodes of fluff setting up two episodes of payoff. Inari Konkon, Koi Iroha (2014) is very enjoyable too, although I think it's closer to a Hanasaku Iroha style coming of age than a romance. I'm a fan of all three shows.
Btw if you could do me a favour. If you can list shows from the 05-08 (or thereabouts) period or even shows after that period that you think I haven't watched that will be appreciated. I'm going on a hunting expedition atm.
That's me paraphrasing. She didn't call us dweebs, but it was pretty clear she thought it was embarassing how seriously we were taking this.
Curious as to whether you forgot about the implied sex in Mashiphony because of how cutesy the series can be with Pannya and everything. (BTW, I think the animators kind of fudged the height difference between Shingo and Miu in that scene to make it look less awkward, he's supposed to be 171cm and she's 148cm, that's like 23cm/9 inches difference.)