Wow, that's a lot-a-questions
Here's my 2cents...
some of the items on your list actually help with clotting (like vitamin K), which means it negates the affect of blood thinners/anticoagulants.
Garlic, vitamin E, fish oil, alcohol of any kind are all thinners.
How much is too much? That is hard to say because each of us clots at different speeds. The aspirin, in addition to minimizing clots also offers antiinflammatory properties.
If your doc has given you the go-ahead, you may not want to skip the aspirin.
Aspirin has been shown to decrease some types of cancers.
Sadly, I cannot find more studies/research on the one that showed women who take aspirin risk a higher increase in pancreatic cancer, but the numbers were very, very, very small.
You can ask your doc to check clotting for you if you are concerned but you can pretty much tell if you cut yourself and don't take forever to stop bleeding that you are not overdoing it.
I will say that it is great that you are checking...even though most blood thinners are taken to prevent heart-attacks and strokes, there is a small risk of hemorrhagic stroke (bleeding too much into your brain, versus the traditional blood not flowing to the brain) for some individuals.
Thoreau said, 'A man is rich in proportion to the things he can leave alone.'