I know how you feel. I am in 1 level higher than you but i have my scroll saw now more than 6 months. Last month i practice every night for 2-3 hour per day but now i am working in my job 10-12 hours per day. Next free time for scrolling will be in January
I do not break the blades a lot - i have more problem that they get lose from bottom clip.
I know that for Oak that thick you need to have good tention and correct blade ( blade for plywood is not good )