You should continue on as you have been and test your levels under the same conditions as this test. That'll give you an idea on your individual response to test and what numbers you can expect in a given time frame. It will also give you a comparison between pharma and 24k without changing a bunch of variables, and using a control(pharmacy test).
Then after that you can dose however you like as you'll be on for life. You'll get it dialed in based on more blood work.
The thing is there's so many variables and since you don't have a history of blood work it's hard to say. I've definitely seen some abnormal shit as I've spent a good deal of time on trt/hrt forums.
For example some people are hyper metabolizers. They cleave the ester almost immediately and metabolize test nearly as fast as they inject it. If this is the case 4 days would put you in the gutter.
Go hang around hrt forums and you'll see this isn't uncommon and there's people who had to switch to eod or even ed injections to keep test levels elevated. Who knows what's going on.
I'd honestly suggest testing the sun pharma under the same conditions. Then the only variable is the ester difference.