Doc wants me to take three 300mg of krill oil daily after my omega 3 test came back. I had been taking 1 krill plus a fish oil daily. Is this unusual?

EPA ; DHA. Fish oil and krill oil have 2 major components: epa and dha. Generally people need at least 1-2 grams of epa, and at least 500 mg dha daily. The preparations you were using may not have delivered this much of each component in the capsules you were taking, so you needed more. Please know that if you eat wild alaskan salmon, sardines, etc at least twice each week, you may not need supplements.
Fish best. No evidence taking capsules help. Recommendation is to eat fish at least twice a week.