Optocoupler output current selection
You don't want to use the peak forward current from the "Absolute Maximum Ratings" section of the data sheet.  If you let 1 A flow for more than a tiny fraction of a second, you will blow out the LED.  50 mA is the absolute maximum sustained current allowed, and even then should be avoided.

According to the datasheet, that SSR is meant to run closer to 20 mA forward current through the LED.

While that SSR is typically operated with 20 mA, 16 mA should be more than enough to operate it.