Ahh, found one of the scientists among us! 
Yes, typically HIE will benefit from activities where you can generate a large amount of HIGH strain. In the workout designer, you can view the amount of HIGH strain that you’ll accumulate from a workout. Like you discovered, try experimenting with something like Ronnestads (30s ON with 15s OFF) using our XSSR intervals (200+ XSSR, depending on how much difficulty you can tolerate), instead of %TP or MMP. You can rack up a LOT of strain that way, but it will also be rather difficult to complete.
The other thing that you should keep in mind is the amount of HIGH XSS the workout will have relative to your current HIGH training load. If you have almost no high training load & hit yourself with a large dose of HIGH XSS, you’re going to be in the yellow for some time.