When in doubt, throw it out.
Abandon your study and go on to another. There is no price low enough to make a poor quality company a good investment.
The worse a company performs, the better value its stock will appear to be.
Because declining fundamentals will prompt a company's shareholders to sell, the price will decline. This will cause all the value indicators to show that the price has become a bargain. It's not!
When the stock is selling at a price below that for which it has customarily sold, you will want to check to see why - what current investors know that you don't.