First of all, you have to enter /enchantrix load always. That will ensure that Enchantrix will always display the values in the tooltip.
After you've scanned the AH with Auctioneer, the enchantrix values will be set to whatever it determines to be the most current. If you take the HSP value and divide it by 2, that is the same as using percentless 50 to get a buy-out price. I go a step further, and use that figure as a bidbroker price as well, and bid on items that have that amount (or lower) as the bid price.
I never try to protect bids. If someone wants an item for more than my first bid, it's not a big deal, and my money is returned to me via mail. There are always more cheap items where those came from. As it is. I DE several hundred items a day.
The following is the way I search the AH:
1. All items level 2-25, uncommon or better.
2. All items level 16-30, uncommon or better.
3. All items level 31-45, uncommon or better.
4. All items level 46-56, uncommon or better.
5. All items level 57-63, uncommon or better.
By seperating my searches into smaller quantities, I'm able to go through a series of price ranges (I don't need to do math as often, because the number of number of percentless amounts are limited). The final search (L57-63) is that way because of the preponderance of Outlands stuff that shows up in the search.