I can share my observations that (in people treating their children) most people are going very low and slow. Start with 1/8th to 1/4 dose (if sensitive) only once a day, then add same small dose for the second time and alternate raising back and forth those two times a day. My son is one of the people who doesn't find it particularly calming, even though it is supposed to be and I have heard this story in others. For some, it is a miracle but even some of them had to go slow. My son couldn't take it past noon at first and now can take up until 1 without sleep disturbance. You may need to divide your dose three times a day, but my son's reaction is very dose dependent. Higher isn't better here for him, and he usually can take massive amounts of a med. I would say it puts him in a better mood, he is more even, and he is finally able to remember what happened at school, the songs they sing and the routine. My son is not really able to articulate his OCD, I can just tell when it's better and it is.
I wish you luck and hope you find a good dose. Some meds aren't for everyone. GABA, taurine, and magnesium are all calming for my son.