Some thoughts.
1. Your progress thus far is incredible
2. sub 10% bodyfat is very hard for most to maintain year round.
3. If you are really around 13-14% its most likely not stubborn fat that you need to do anything special to work off. Dream is right just keep at the calorie deficit.
Personally I am right around the same weight and bf%. Calipers have me a little bit lower but I dont trust it and instead use an equation based on neck, waist, height, and weight.
I would just push the calorie deficit on your diet and maybe try adding more weight lifting to your routine. And dont waste your time doing ab exercises as you cant spot reduce.
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