I couldn't tell in the pics of the build, but wondering if you have any support running the length of your roofline? Not a bad idea with a hoop house that big...after the second hoop they seem to need more support for heavy snows. Saw a pic of one such collapsed under a couple of feet of snow.
I added a third hoop to my hoop coop this summer and went ahead and reinforced the arch with a 2x4 down the length of it, just in case.