Early this year, when I brought the shinai to the dojo, Spencer Sensei told me, "I have this one too. But, you have to watch out b/c this shinai makes you to use more right arm. So, it might be good idea to practice w/ both your regular shinai and this big shinai."
At the time, I just made a mental note of what he said but didn't really thought about it.
Starting a few weeks ago, I wanted to enhance my swings, but I started practicing suburi at home w/ the big-thick shinai. I thought, 'If I practice suburi w/ this, my swings and strikes will be so much faster and stronger...'
But, at the practice yesterday, I hyper-extended my right elbow many times. I've realized that doing suburi w/ that big-thick shinai really did make me to use a lot of my right arm. (Then I remembered what Spencer Sensei told me long time ago)
From now on, I should use the regular shinai to practice suburi, and reserve the big-thick shinai for an occasional suburi practice.