I use the Indian version, great blades works really well with Karve C and Variant. Didn't feel good with GC .84.
Which setting do you use on the Variant? I would suspect that the 7 O'Clock Black might be too sharp for comfort on the higher settings of the Variant.
I have a Karve SB D plate on the way. I will probably try some of the milder blades in it at first before trying some of the more aggressive ones.