I added length to my support rods, and improved signal. I don't remember the exact distance, but what you describe is close. I think the BV was setup for the "good enough" world of analog 25 years ago, and further tweaking CAN help with digital signals, even though the basic physics are the same...
Oh, and if you decide to remove the scalar, get ready to break one of those aluminum poles, the nuts that hold the scalar corrode themselves to the poles...before you start soak the nuts in some PB blaster for a few days, then get your ratchet and socket, say a Prayer to the Diety of your choice, and have at it. I broke 4 of mine I think...