I think when double tracking is on, it sound not good. so a vlues to reduce delay is good. it sound as there use a mono signal and invert phase of 1 channel or delay is too much. sure it sound wider but my ears get pain after longer hear. same happen when i use a normal stereo song and use a stereo widening tool and set stereo width to 200%. it sound wider but my ears do not like it.
I own AME metal guitar. this have a value to set the doubling delay. I think only values of 10-25 sound good. higher values sound not so good. so it is good if there is a wide value in H7S possible too.
I notice the utility effect is good to modify doubling so it sound good. I set left delay to 3 ms and width to 20%. now it sound same width but for me much better.