Working in the larger format is a fairly recent development. Up until a few years ago, I worked almost exclusively in 5x7 image areas. The few attempts at larger 9x7 blocks always seemed to end in disaster. After I bought my press, I gave the larger size another try, and never looked back.
Unfortunately, I have been wary of using the rainbow roll on the larger blocks, mainly because the brayer I use is only 8", and that poses some challenges for the rainbow roll. I did have a 12" roller I bought several years ago, and I tried it out on this print, only to find the roller was uneven, and useless to me. There's $25 I won't see again.