As you mentioned, synergies works only on "skill tab clicked skill points". So in case you click 10 times on Blessed Aim, it will bring you a maximum damage bonus of 0.15*10=1.5 to your blessed hammer. Additional +skill item does not bring more bonus for blessed aim to your hammer damage. This is my testing result, and I hope I have understood your question correctly. Feel free to ask if you are wrongly understood. :rolleyes:
p.s. Those +skill items still affect blessed hammer base damage and offensive aura! :rolleyes:
p.s. Those +skill items still affect blessed hammer base damage and offensive aura! :rolleyes: