I would personally drop Bird Caller to Level 3 because it still has a 50% chance to double proc. Rurikkan made a video showing some fast routes and usually doing em even with level 3 will max out my HP and Stamina and get close to maxing out attack and defense. Level 4 would max everything faster, but it seems a bit overkill, usually max health/stamina and near max attack/defense is good enough.

Personally I use Super Recovery on level 4 so that way I get constant health regen. Another option would be using the Defender one (the old one) since that's basically giving you a free Divine Blessing 3 which is pretty good. It's like you're getting 3 free two slot decorations for eating food.