As a general advice, it’s helpful to watch matches on YouTube of high-level Dictators to get a feel for what to do in the matchup. My usual go-to player to watch is YuuVega and Taira.
Versus Honda, just play hit and run and don’t challenge him in the close mixup game. You will lose. Get your hits in or chip damage and run away. Conserve super meter for punishes or escaping his tick throw attempts. Jumping back is a great way to punish Hondas who like to abuse fierce headbutts, REALLY good Dictators are able to stuff it clean with a st.jab (very tough to do consistently though) On knockdown, it seems best to go for a safe crossup attempt into a blockstring that does chip damage and run away.
Versus Blanka it’s pretty much the same idea as his tick throws are virtually guaranteed. Against j.MK the most successful things I’ve landed is a preemptive j.MP juggle or j.LP. As you noted, sac throw also works, but requires that they hit you high on the head. If they catch on to what you’re doing ,they’ll just aim low and hit you clean. Being proactive in getting your hits is the same strategy here. Stick and move, hit and run, just don’t stay stationary for long.