We checked, and the raise is live: Dark Axe Stumps now drop the Sap of Ancient Tree about 5x as often as before (about 3 in 100), and Stumpy drops it much more often too. On your hunt yesterday you collected 8 Saps from about 400 stumps. That's a little below average luck, but at the old rate you'd have had only about 2. Keep at it and the numbers should even out!