Ohana - have always seen Mickey and Pluto there... we love it there for Stitch and Pluto.
We love both Ohana and Cape May. Cape May is very good, nice variety, and yes, Minnie is there, with Goofy and Donald Duck (love Donald!) Very good character interaction at both places.
How about Cape May on your epcot day? Then can just walk over through the international gateway. To get to Cape May - actually would be quicker than going to Ohana from Pop - but involves taking a cab we've always found is the best way. Nice and quick, and nice change from waiting on buses. We've done it from Pop many times... oh, thinking maybe $10 or $12 tops for the cab (and that estimate includes a tip)
Going from Pop to Cape May we allow ourselves 10 minutes of travel time - simply go out front where DME dropped you off at arrival, ask someone there that you need a cab. They're in the parking lot waiting. Pop to Ohana - we allow 50-60 minutes for travel time, more if we want to get checked in a little early.
As for making rope drop at DHS... even with an early Cape May, not sure it's doable. Getting there maybe 9:15, 9:20 - that I can see as happening, maybe earlier if are quick eaters and characters come around fast to you -which we never wait TOO long there for the characters.
For DHS day, if kids like playhouse disney characters, that would be a good one to get you into the park for rope drop, the HOllywood & Vine breakfast.
Ohana on your DHS day... then may have to wait a bit for bus from Poly to DHS. Ohana on Epcot day, we did that last trip, was pretty easy to just jump on the monorail and then switch to Epcot monorail.... if you said 7:45 ADR at Ohana, would estimate getting to Epcot between 9:30 and 9:45.