Replace one of your optoisolators directly with a 170V+ logic-level drive power MOSFET, like IRL640STRLPBF. The major disadvantages here being the need for a freewheel diode to protect your 'duino from inductive voltage spikes from the coil, and contact wear/welding on the relay itself (and relay noise, if that's a significant concern). Replace one of your optoisolators with a 5V drive, 170V+ load relay, such as this one. I see 4 options for accomplishing what (I think) you're going for here:
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