There needs to be more "level me" recipes, I leveled carpenter from 6 to 17 all from producing elm lumber... lots and lots of elm lumber (boring but efficient). That I gathered myself, I had ~7 stacks of 99 elm. (I broke them a lot in the beginning but when you have 7 stacks you don't care..)
I agree on this point too. On my 41 Crp theres pretty much nothing but walnut masks all the way to 50. Especially with how long it takes to farm Rosewood. Walnut is just more efficient.