Epimetheus is an absolute belter of a line, as is the G!!!
I did put in E grader. It's a strange one though as just done my own big highball at another venue an wondering about how to grade. Found a thread here from 2019 re Highball grading as was interesting but didn't help be answer my troubles. But Epimetheus and my line (The Jabberwocky) have both been bouldered first so default the use of an E grade (or do they....?). Asked Robbie P and he said (if bouldered first use boulder grade!).
Anyway, I don't wish to start that and distract from Rob's work here. Do check out the vids, he's done a mammoth amount of work to develop this area and get access permission. So get up there and be respectful of the area and landowners when you do