Flatbed question

Hauling these 50-foot steel roof trusses and having some issues. Load keeps shifting even though I've stopped to re-tighten straps like 16 times already over 200 miles.

Here's what I've got:

• 6 bundles of trusses, each wrapped with metal bands front/back, 2 layers
• Sitting on wood decking
• Straps over the top at 20 locations
• BUT there's gaps between each bundle where they can slide against each other
• Front and back lower trusses are lifting away from the wood at front and back

I'm reading 49 CFR 393.110(d)(2) says structural steel needs to be "blocked to prevent sliding in all directions" - but there's NOTHING between these bundles to stop them from moving.

❓ QUESTIONS FOR YOU EXPERIENCED FLATBEDDERS:

• Is this load legal as-is?
• Should there be wood blocks BETWEEN each bundle?
• Am I missing something obvious here?
• What would YOU do in this situation?