Your total test is high but free test and bioavailable test is the only thing that matters. Testosterone that is completely bound by SHGB will not have any effect on you. Your free T level is fine, but as a ratio to total testosterone it’s low. In other words, if you can lower SHGB you’ll increase free T and get more bang for your buck, so to speak. You can lower SHGB by taking steps to lower estrogen. Your estrogen is already in the high range so you could consider an aromatase inhibitor, but don’t go crazy, your body needs estrogen. If you totally crash estrogen too low you’re really not going to feel great at all.
There are people on here far more knowledgeable than me, but ask around and they’ll chime in. I think I’m usually decently on point with this stuff but get particular and specific advice as to dosages and protocol from others.
As to your anavar, it’ll be fine. 20 mg, 40, 50… that’s fine. No need to crush it. 8 weeks is fine but frankly longer is ok, but at your age pay attention to your kidneys and liver if you do higher dosages or longer cycles.