well its a two way road, yes you can probably run it without the R134 and the propane wil have a lower boil point but it takes a higher head preasure. if you add the r134 it raises the boil temp BUT takes lower high side preasure and as i said its a two way streed lower high side means lower low side preasure meaning more efficancy out of the refridgerant possibly resulting in a better temprature overall.
BTW: i did noticed you said you were going to run like 45% r134 that may be a bit more than needed you will only get like a -29C temp with that under GOOD conditions. id say more like 15% R134 and 85% R290 will be a bit more efficant.
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