printing 1.75mm filament with .6 mm nozzle

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I posted this on um groups and discussed with few people, but nobody yet with any real experience.

 

we have a lot to print and wall detail is not an issue so we would like to print using a 6mm nozzle but are limited to systems with 1.75mm filament. .Will use a 3 mm layer height and print around 50mm/s using colorfabb XT. Even if we change a few parameters around, we are still looking at printing between 7-10 mm3/s.

 

My questions:

1. I've always limited XT to about 5mm3/s, not much success past that flow rate. Raising the temperature to 260 or more is not really an option. What is your best flow rate with XT?

 

2. What is the max flow rate for 1.75mm filament, and any limitations on using larger nozzles? retraction will be minimal.

 

thanks for any help