Thanks Eric, yeah i think it is the same problem. I think I used larger clumps (the 2nd largest variety from Woodland Scenics), which made the tension bigger, but in the end this also meant that i was able to glue down individual clumps with the hot glue, which is why i think it took me longer to finish than you.
BTW... your hedges were what inspired me to do mine. But I must have missed your WIP posts (that was a maniac time at work back then, so i had to learn from scratch!