I'm supposed to pull the wires for a massive chandelier 120 20 watt candle bulbs I come up with 20 amp load by calculation. The guy doesn't want to downsize the bulb wattage to 10 watts as the bulbs are included with the chandelier he also wants it on a 4 way switch as well so is there any way to use anything wire wise less than 10 AWG as 30 amp switches are ugly and expensive I had pulled a 15 amp circuit by itself for the fixture thinking it would be more than adequate well I was wrong when he gave me the bad news I have 2 of these to put up any help would be great.

I did not back check any of your calculations, but if you need 20 amps, then why not just run a dedicated 20 amp circuit to the fixture and use #12 AWG cable.

Pull the 10/2 to fixtures with a 30 amp relay. Use 15 amp circuit to switches to control relay.

If this is in a dwelling you cannot have it on a 30A circuit. In other than a dwelling you can put it on a 30A circuit.

Have you considered feeding the fixture with two 15A circuits? You'll still need a relay though for a 3/4 way switching setup.

Where is this fixture going?