I race 4 stroke engine go kart, and a very respectful engine tuner said to me that if I run with little less oil then the engine level (80 % of recommended, 0,8 l) it will break sooner but will become... (mechanics.stackexchange.com)
It did eventually become the consistency it should have without the need of adding more chick peas etc... though I think I would have to put in a little less oil next time — 15tbsp is quite a lot! (deliciouslyella.com)
I haven't baked with Hazelnut but think it should be okay... maybe start off with the same amount of flour but a little less oil, maybe 3 tablespoons and see how it holds together. (healthfulpursuit.com)