Same here, I get a ratio of about 1 wanderer scroll for every 10 chests, far better than the 1 in 40 that it should be. But even then, Ancient Knowledge is not guaranteed. I only dug up 2 AKs, and I have cleared Debir-Scarlet-Bolo-Rusty and around 5 fights at Verona. Tons of other wanderer scrolls though... but you only need one Depth of Thought (to get Elenhel early), maybe 1-2 Call Colossus early on (before hitting Bolo/Rusty), and 1-2 Call of Death/Call Colossus to get Bone Dragon and Black Knights, that is if you go the undead army route. Everything after that is just extra gold, with the sole exception of Ancient Knowledge.
Playing a Warrior, I'm at the point wherein I take a Magic or Mind Rune over a non-AK wanderer scroll.
6 AK scrolls built-in? That's beautiful!
If you get enough additional AKs from chests and duplicate navi maps, maybe you should try for level 61?
DGDobrev, you've done a level 60 run before. Is level 61 possible/reachable?