I think if your metabolism is not screw up for eating 30 + more years on industrial crap going low carb is completely nonsense, I went low carb just like everybody else who got into this the paleo thing. My mistake was thinking paleo = low carb...now I understand that paleo is basically non grains, veg oils, sugar/fructose.
I felt/look muuuuch better with more tubers & less fat (indulging in butter is bliss, but it just didnt work for me).
I think that the term high carb is nonsense...it should be replace by high tuber IMO.
About the OP, I can definitely see more abs definition since lowering butter & upping tubers, but as the cliche says "everyone is different, do what works best for ya"