You're running 10 hours of blast furnace per day. Now tell me who does only 10 hours of blast furnace when they play OSRS per day? This is a red flag for their heuristics.
My recommendation would be something like 4-4-1 but with breaks and variety. Two moneymaking methods (4 hours each) + 1 non moneymaking separate method that is skilling or questing.
4 accounts per IP is not a red flag but if one account gets caught they will all be caught.
If you need some moneymaking methods hit me up with a PM. I can provide you with two recommendations (for free).
AWS is a ripoff, it's designed for scalable businesses really. You can easily find cheaper hosts out there just using Google.