FWIW, here is my finished setup. It's a frost blanket off of Amazon. I used 1x6 and 8' x 5', with 1/2" PVC for the hoops. Padlock hasps for the corners for easy disassembly.
Iām also in the school of āif it aināt broke donāt fix itā because any time you make any sort of significant change to your āusualā you risk introducing new and unexpected problems you may not have foreseen. That said, your new set up looks solid and I donāt see any reason youād have issues with that.