Sounds like the 1.7 is in inches/second, from your Partworks. Your conversion software needs to be scaling it by 60 for ipm in mach3. If you can, just change the feedrates in partworks by a factor of 60.
For now, just replace F1.7 with F100, wherever it occurs.
The F word (F100) applies to all G01, G02, and G03 moves, regardless of which axis is moving.