You're actually not that far off, going with the higher end (145ish).
Currently, you're 160 @ 22% (your estimation) - 125lbs lean, 35lbs fat
Looking ahead, if you were 140lbs @ 10% as KP mentioned - you'd be 126lbs lean, 14lbs fat. So, you're right in that you will have lost roughly 20lbs, but you'd be WAY too lean to maintain health/homeostasis.
Projecting 145lbs @ 15% (which is feasible, and a much healthier goal), you'd be carrying 123lbs lean, 22lbs fat. So 15lbs lost in total, 13lbs being fat, 2lbs being LBM which is definitely realistic (possibly more LBM and less fat tbh, but not necessarily).
As you already mentioned, your best bet is to continue until you achieve the look you desire. Getting too wrapped up in the numbers game will only make you miserable.