airytime, in answer to your questions:
1. 4iu's ed would be better if you really planned to take it every single day, but you should not take high doses daily for too long without giving your body a couple days break. 6iu eod continuously would give you better results than 4iu ed for 5 days a week.
2. GH is entirely dosage dependent, with a VERY short half life, and there is a minimum you must take at a time to get any benefit. If you're going to take 6iu, take it all at once. You'll get much better results than the other two options.