Loading at 100,000 IU/day for two days should elevate your 25(OH)D by 20 ng/mL which should bring your total serum 25(OH)D3 serum concentration up to 170 ng/mL. It takes roughly 24 to 36 hours for each dose of vitamin D3 to be hydoxylated by the liver to 25(OH)D3 so if there's no response 24 to 36 hours after the second loading dose of 100,000 IU vitamin D3, I would be tempted to add one more day at this loading dose.
Of course a trip to your PCP/GP for another round of labs for your serum 25(OH)D3, calcium and PTH will be in order one way or the other in a week or two.
The rest of your plan looks sound.
Please keep us posted.
V/R, Batch