Hi guys, I still don't have a Dynabar, but have been doing research into it again in the last couple of weeks..
I watched this excellent video on the V8 just recently. When you all mentioned the same issue with the longer bar, I thought I'd post this for you to see.
The whole video is great IMO. Really informative. He shows so many configurations options as well as the changes to Version 8. I'd watch it all if I were you.
However, the spreader bar 'issue' you are referring to starts at 2:10 in the video. It's not what you'll want to see having already purchased the larger bar but it does explain what you're experiencing, and why.
This product is getting more refined every year, it looks more versatile than ever now.