Do you think it’s okay to leave my safety zone at 5 and increase the block count using attribute? The extra skill points will be invested into cure instead… from a Sadhu c1 or c2 and a non Sadhu build with krivis 3
If you play more in groups than solo, I think its ok 
I would absolutely get at least Cleric2. Sure getting Cleric3 gives you stronger skills, but you still have the problem of a lack of filler dps skills. With Cleric2 and Attributes, you can effectively fill the role of Healer. The most important thing here is Safety Zone Lv10. Lv5 SZ simply will not cut it; it will fall off too soon before you can get in your full rotations. I’d rather keep Heal at 5 and add an extra 5 pts into Cure. This would mean you could at best be a secondary healer in a party. Despite that, your Lv5 Heals would still heal for a good amount with 30% attribute (at least it did for me).
P.S. With Out of Body Attribute at 30% + Kaloo Hammer, I was dealing about 800+ damage per hit in OoB. I didn’t even spend “dozens of millions of silvers to maximize its attribute” either, since there was no need to. It’s a filler dps skill.