This is true, aukuras will not use your hp recovery stats. Instead, aukuras heal over time gets bonus with your CON (100 CON = +10% HP recovery effect). Also when I was pala3-krivis3, restoration lvl 15 did not boost aukuras recovery at all.
Yes owls still have the 79% magic damage x 3 hits scaling on max level. Miko Clap is still best synergy for diev statues. If you are worried about heal, you will probably bring another cleric (cleric2). Vs field mobs, you won’t need heal 10 (solo) and you also have statue of ausrine&melstis combo for party play. Cleric2 is recommended for 100% healing supply for party healing/support.
If you will only boost zaibas and use the melee bonus damage attribute, taoist 1 is sufficient for stormcalling talisman.