Hi witters,
First of all, good luck with your experiment !
When you have done your next run(s) I strongly advise you to sell your ores at a higher markup than the ones you are currently selling at. You really should get around 3% more for everything you are finding.
If you aren't doing so already, I would buy a decent orerefiner (TT one has worst eco) and only sell refined ingots. In auction there often are orders for most ingots, so if you need money fast, you can always sell to those orders. To reduce the effect of the auction fee, you best stack ingots untill you have about 50ped TT of a certain type. If you do this, your overall results will improve for sure.
Just some advice from another Belgian miner
Quint