Here's the problem with your question.
Ideal ratios are not a thing. There person dependent. Most ppl will do fine with 2 to 1 test to mast to start. But as the testosterone dose increases you will need significantly more mast to combat estrogen. But, some ppl can run a gram of test with no estrogen control and be just fine. I myself and many others here like a 50/50 split, maybe slightly more test, but for so.e ppl that will give them low estrogen sides. So there's just too many variables.
I dont use high doses of test or mast, but I've seen plenty of ppl run crazy doses. The guy who's helping me plan out my next cycle has ran some pretty high doses and he's run into a contest prep on 1200 test, 1200mast and 300 tren. Pulled test 3 weeks out and added all the dht orals and ai's. Did not crash his estrogen.
There's just so many variables.