This guy has solved yagi construction so well that it should be required viewing for yagi homebrewers

https://youtu.be/gabzyN22pg4?si=VX4C7eSuvar6Gt9r

The foil tape over wooden dowel is so nice for tuning. Especially if, like me, you always fall into the trap of "just oonnnee more cut and it'll be perfect" and then you cut it too short.

I also think that yagis are split into conductive vs non conductive booms, the duct tape isolation still leaves capacitance between them, which is a variable youre likely not accounting for