I'm really digging this. A few things that stuck out to me before I crash for the night:
The constant hi-hat throughout the slow section is super repetitive. I would suggest waiting to bring it in later at a time you feel appropriate, if at all.
The end of the synth solo, at 3:15 where you've just got long half notes, you're begging for some counter-melody. Throw in another voice on top of it to spice it up a bit. Actually, there's quite a number of places in your mix that could do with some counter-melodies. For the most part, you have only three voices (lead, bass - or backing strings, during the half-tempo bit), percussion), and while that's a good start, you would really benefit from something extra. It doesn't even have to be anything too noticeable... just something.
Speaking of your basslines, they rock. As does your solo, barring the little guy in the back of my head that is pointing to the many solo virtuosos around OCR and shouting, "MOAR VARIATION," which seems to be the common theme here.
I can't say anything about this in comparison to your previous version. Sorry, I wasn't here to listen to the first version and I'm too lazy to go back and do a thorough comparison
Last, I would highly suggest modulating to another key or mode at some point. This source is really really really repetitive and having to hear the same chords over and over again can start to bore your listeners, even with the variation that is your down-tempo section. It also opens up a bunch of really interesting harmonies that you may not have thought of otherwise until you've started messing around with a new mode.
Anyway, as it is currently 4:45 in the morning, I'm off.
Best of luck! I hope this helps!