God, where do I start?
300mgs of Cyp over four weeks is a pretty good starting protocol - if it is injected in eight batches i.e. twice a week! It is a complete and utter disaster to have Cyp injected once every four weeks.
Insist on doing it yourself! Do not take "No" for an answer.
Cyp is the longest estered T available, with a half life of about 14 days. Which means that your levels will spike after about a week, then for the next three weeks they will drop so that by the time of the next shot they will be a quarter of the peak - at the most. How do you reckon anybody would feel on that roller-coaster?
Get them to prescribe Test E and inject it yourself. There is another huge advantage - injecting 0.5ml every three days (E3D) using a 25g needle in your delts is totally painless, quicker and easier than cleaning your teeth, creates no scar tissue, has no post injection pain - are you starting to get the picture?
As for your question: I recommend you try to find the minimum that you need, and go from there. Test E 0.5ml E3D is too much for me - levels of 1400, and I'm a big bastard! You may well get away with much less, which means less aromatisation too. Oh yes, I suppose your medical experts didn't tell you that a T roller-coaster is a great way to aromatise T to E. as a metter of fact they probably don't know that your E levels are . . .Hoh, they didn't check? Such a surprise!
Half life ain't hard. If its 1,000 on day 1 and it has a 14 day half life then it's 500 on day 14, 250 on day 28, 125 on day 42, 62.5 on day 56 and so on. If you re-inject on day 28 then you add that dose to the remaining dose from the first inject.
But the half-life is a guess and it isn't the same for everyone, and isn't the same for different injection volumes, or injection sites. An example: if you inject 2ml in one site (depot) if will be available more slowly than if you injected 4 x 0.5ml shots in four different sites.
The only reason you would consider a long ester is if you simply couldn't inject frequently.