Did you try a four second delay? The second flight on my solo was on a B6-2 and my log notes “short delay”. After that flight, I have logged seven flights on my Solo using B6-4s, and several in my log note “Perfect delay”. The glide is around 17 seconds. There are no mods that make it heavier, and it is flow straight up when there is little wind. If there was wind or the rod was angled, I would go with the B6-2.