You are definitely not the only one.
The reason that you need to check every 10 questions is precisely so that you can adjust. If you were exactly on time, you wouldn't need to check. :)
So when you see that you are 2 minutes behind - that's okay and don't change anything. You can be within 2 minutes of the target time (in either direction).
If you see that you are 4 minutes behind, the very next time a hard Q pops up (you know the ones, where you immediately think, "Ugh, why did they have to give me THIS one?"), guess immediately. Save the entire 2 minutes (well, 1m45s). Now you're within the acceptable window. If you see another crazy hard one, go ahead and guess immediately on that one too. Boom. Now you're back on time!
Think of it this way: you're running a marathon, and you're trying to keep to a steady pace. Every now and then, you discover that you've been going a little too fast or a little too slow, and so you adjust - get yourself back on track and then get back into your pacing plan.
Next, address the symptom. If you always find yourself 2-4 minutes behind at the pacing markers, then something's off. (If your timing is really "on," then you should sometimes be ahead and sometimes behind.) So that means you need to work harder on cutting yourself off on the too-hard problems.
Here's how:
http://www.manhattangmat.com/blog/index ... to-win-it/http://www.manhattangmat.com/blog/index ... -to-do-it/And:
http://www.manhattangmat.com/blog/index ... nt-part-1/That mindset issues discussed in the first article will help as well. You're not actually trying to win every last point, so who cares when you have to sacrifice a couple of questions? In fact, I know I'm going to have to sacrifice
something, so I might as well get to choose which ones for myself. (And, of course, I'm going to choose the hardest questions for me!)
Also, here are a couple of resources on stress management, just in case:
https://www.manhattangmat.com/blog/inde ... mat-score/http://www.manhattangmat.com/blog/index ... anagement/Good luck!