The real question is...how did it taste?
Do you want to produce a nice curve with bad tasting coffee?
If (for YOUR roasting setup) you have found a 16.5 minute roast is about right for these then you might want to move 1st crack to 11 minutes by ramping a little slower. You also might like to try keeping the 1st to 2nd crack a little more positive... 2 or 3 degrees per minute in the roast monitor software seems to be pretty good for my setup.
Remember: There is no right or wrong, just different. If your results taste great for your palate and work for your roasting equipment then keep the same profile!