Shower Adjustment

Whilst I was installing the new thermostatic assembly, there was an adjustment requiring a hex key.  Since then, I swore the shower was not as hot was before.  So I finally got around to adjusting it, I turned and turned and turned, it kept going, I thought it would just be a 1 turn adjustment.  To test out the new setting, I had a shower, by now, the shower is scalding hot!  So hot that I turned down, twice, and it is still hot, acceptably hot, steaming hot!