You need to talk to the Dr. maybe he will chim in on this, Last week he said to start with 50mcg in the morning and just stay with that don't go lower or higher, 50mcg pre-meal upon waking.
And dude you need to research a bit, if you do then you will find that taking GH in the evening pre bedtime is just dumb. It will interfere with you natural GH production during your sleep. what you want to do is manipulate the body to still use it's own natural GH at night while you give yourself Exo Gh during the day to keep consistent levels. Take 3iu in the morning and 3iu mid after noon
The doctor could give you more info he is a pro at that stuff,