Okey, never heard about this "three strike" area. But I found a place where I got a lot of bolts. There's 2 smaller maps of the Thunder Plains.
One map BEFORE the inn, and one AFTER the inn. I was at the second map (after the inn). Get a peaceful shield or something and then just run untill you see a big hole in the ground. I ran around in that hole and dodged lights, and I ended up having the sigill pretty fast. Wasn't that hard. You'll get the timing after a few bolts and you'll get reflections of taping the X button the screen flashes.

Those who complains about this being hard must suck at dodging bolts, because I messed up a couple of times, ended up with dodging over 800 bolts. And I did that in less than 60-90 minutes. Put in 20-30 minutes for dodging the bolts. Then you're done.

I think Kimhari's sigill is WAAAAAAAAAAAAAAAAAAAAAAAAAAAY harder to obain than this. This is like walking on sunshine compaired with Kimhari's sigill.