Adobe Premiere Pro 4 and up mixed frame rates

So I've seen and received a whole lot of conflicting information about mixed frame rates in APP. I seem to always wind up dealing with footage of varying frame rates, and my current project is no exception. I'm editing on two machines, one Mac running 5.5 and one PC running 4. The footage is 60p from a Canon 7D, 24p from a Canon 5d MKii, and 60p from a GoPro.

What is the best workflow if I desire a 24p final export with a mix of regular speed and slow mo footage? Here is how I'm dealing with it, along with the issues I've encountered:

I'm creating a 24p 720p DSLR video sequence. For regular speed footage, regardless of frame rate, I'm simply dropping it into the timeline, downscaling higher res footage to 720p size. For the slo-mo stuff I'm interpreting footage from 60p to 24p.

Prior to export, the slow mo footage looks great. The DSLR 60p footage looks okay only after unchecking frame blending on the sequence clips. The GoPro footage is pretty much the same.

Should I turn frame blending on in export, or use any other export options to help mesh all these varying frame rates? When I export at 24p with frame blending unchecked in the sequence and in the export settings, the 60p stuff left at regular speed looks decent, no ghosting, but it does have a flickering far more pronounced than what you get with footage that was actually shot at 24p.

Basically, I'm wondering how best to deal with 60p footage at regular speed in a sequence you intend to export at 24p? I want this because I prefer the look of 24p over 30 or 60p, and most of the footage will actually end up in 24p slo-mo (via interpreting from 60p) anyway.

Some message board conversations I've read here and elsewhere say you can just drop 60p footage into a 24p timeline and it will automatically drop frames/confrom just fine to be export at 24p. Is that true? One post I read suggested it would work fine as long as frame blending is on. That doesn't look good to me. There is a lot of ghosting.

I'm trying to find a really precise answer to a problem that has a lot of variables. Can anyone dig through all these complications and provide some insight?