For me HRs are Vex and up. I actually thought that those were commonly accepted as being the high runes, but I'm probably mistaking.
So I didn't find a Vex or higher in 1700+ runs. I'd have to check just how many of the others I found during that time, but I did find at least one of Gul, Ist and Mal and several Ums and Puls.
I don't do 20 - 30 second runs though. On a previous map I was rather close to 30 seconds I think, but on my current map there are a lot of other poppables close to each other, so I hit those to, and as a result I only do 100 per hour. Except for the 2 corpses near the campfires, I hit at least 6 poppables, sometimes 7 or 8. Still not sure if it's worth it or not, but they are on my teleporting path, in groups of 2 or 3 (and one I hit right from the waypoint), so I don't loose too much time on them.
Maybe I should indeed focus on runes only. Right now I pick up flawless gems and small and grand charms as well, and the occasional grailer. I also pick up every unique to check if it's ethereal. Obviously this takes a lot more time. Not only picking them up, but also the time spent in town (once every 15 - 20 runs), when my inventory is full, and to cube up gems and reroll charms.
Thanks for the input. And
@NorthDakota your post didn't come across as bragging (after all we all depend on the D2 drop gods

), and I tend to ramble a lot myself, so your post surely didn't feel that way to me

.
Btw, after reading
@NanoMist's post in the 99er thread, about the progress he made, I realized I just have to start running for xp again, and those HRs will drop eventually.