Some background:
Landing flaps on a GX is OUT/30. Standard go-around config is OUT/6. So this case was at neither the correct landing nor GA config.
The recommended Vref increment for a flaps 16 landing, per the AFM, is only +6 knots (not 10-20) and with that increment the ALD factor is about 40% (it depends a little on other factors, but not much). So, assuming that you flew the recommended speed and had no other problems, you'd be inside the nominal 67% LFL/ALD factor.
But, if you flew near +20, then looking at the flaps 0 case (where the recommended add is +20) you'd be getting close to 60% as a distance factor, which might be eating a lot of your margin.
(That's all assuming your message was FLAPS FAIL - if it was SLAT-FLAPS FAIL then you'd get higher adders and distances. )