Welcome.

We have Over Power Astrologian and still get more buffs so I have suggestion how to make Astro more power full!

Lets allow use Synastry on myself to convert his additional heal on target to the flat % buff on heal potency.
Example: When you use Synastry on your friend - you gain 20% heal buff + 40% your base heal will be on your marked target - great but still only on single target, on AOE we are worst than whm with Divine Seal.
But when we will cast Synastry on myself game will ignore 40% base heal and convert it to extra 10% to all spell heal power.

That change will make Synastry same as Divine Seal so more people will use that ability to boost his AOE Heal.

Why buff more astro you will ask? Lets make tradition continue and buff astro with every big pach XD