I play a very similar build (Cleric C2>Krivis C2>Sadhu C1>Druid C2) with 80 con and the rest int.
In terms of solo play, I was able to finish every quest with no problem (lvl 224 currently). With max Sterea Troft, it can be cycled with Safety Wall for up to 40s invincibility if Safety Wall managed to last 20s.
Mobbing-wise, this build tends to fall off as every monster will consume 1 hit from Zaibas and Carnivory but we still have Heal bombs in case needed. The biggest problem with this build is flying mobs as only Zaibas can hit them.
Personally I find this build shines the most in bossing. While it may not have the highest burst damage, I would say it has a pretty high sustained dps. Soloing world bosses, I would get a cube about 7/10.
As for Diev, C1 don’t really offer much. If I was gonna play Diev I would probably go for something like (Cleric C1>Krivis C2>Diev C2>Druid C2). As @vszalek suggested, Priest C1 might be a pretty nice for soloing but will be useless if there is another higher rank priest in the party.