You might try heating the blank in an oven or a microwave before you dip it. My friend Barry Starud, of Barry Baits, does that before he dips in a penetrating epoxy, and he gets really good results.
I dip my red cedar lures in the wood hardener, and it does penetrate and harden, but I've never cut one open to see how far it penetrates. I make sure my lures are fully shaped and sanded, and that all the holes, for line tie, hook hangers, and potential ballast, are drilled before I dip them, and all of the holes are really hard afterwards. Cedar is a softer wood than Maple, so it may depend on the wood you choose, too.