750 test is definitely a great mass builder. If you respond well to it I don’t see anything wrong with sticking to what works for you.
As suggested, a good-possibly better depending on how well you respond to/tolerate it-alternative would be to consider less test, and introducing nandrolone at a moderate dose alongside it. Even something like 300 test 600 deca would be damn solid. A lot easier to control estro and in turn prolactin with less aromatization from lower test.
Personally I’ve never liked the idea of starting with an oral. I feel it’s better to wait until week 6-8 until the other drugs have really kicked in so you can get them all working in full force. In the first 4 weeks you’re essentially doing an oral only cycle, and even with those other steroids, when you come off of an oral, you do lose glycogen stores, and ultimately you don’t look as good as you did while on it despite benefiting from your main ‘mass builders’ now. Especially only 4 weeks in if utilizing deca. You will also be able to notice any sides in those first 6-8 weeks so you know that they are being caused by X drug instead of the oral. At least when you come off at week 10-14 you’ll be feeling the test/deca 100%. Further, SD may not be the best option if your goal is strictly mass due to the toxicity. If this is your first time using it, and you haven’t tried some of the other commonly touted mass building orals (dbol, adrol) I would advise giving them a shot first (you may also be able to run them for a longer duration). They will help you gauge how well your body handles moderate toxicity (below that of SD, but still significant). If you see that your appetite is taking a hit and it’s impacting your ability to eat, and in turn, grow, you’ll know SD isn’t even an option going forward since more mild drugs induce it. If not, it’s something to consider for next time. If you’ve already tried SD obviously disregard this part lol.