I played a bunch of side events with BUG Midrange (BGu) and Jeskai/UW control is miserable if they land a Teferi. The matchup seems very hard since they have so much removal. I believe this build is better against aggro (all in aggro) and midrange but is terrible against go wide aggro and draw go control.
Not sure How I want to tweak it but I've gone up to the full 6 discard package and want to test out 2x Kalitas. I really like Nissa/Serum Visions/Grim Flayer+Bob. Ashiok is too swingy and either very meh or very good, I think I"m going to remove it for a Thrunn to help my control matchup. Some other considerations for Kalitas replacements would be Vendilion Clique or Damnation. I also want to add another cast down but don't know where to trim. The most obvious spot for me would be removing 1x IoK.
For those wondering, I dropped the heavy control version of BUG because although I enjoyed it, I'm just too slow of a control player and I kept going to time.