IMO, since what you are using contains very little spin, your concern shouldn't be how so much distance you will lose with your combination but how much carry and roll you will have. The best way to find that out IMO is to use the courses feature and play some single holes with little wind using each of your clubs and jot down your average distances per club. Then you can start compensating for Wind, Elevation etc.
Once you change clubs and balls then you will need to know for those.