I didn't think anyone rode boards narrower than 38 anymore. I ride a lunacy 132 x 41 and am 76ish kg. No issues riding powered or overpowered. It's all technique.
Edge properly, stop doing the poo man and you'll be right. Just practice. Onshore with waves will always make it harder. Board dimensions you have sounds good.
I used to ride the lunacy 129 x 39 and moving to the larger size took a bit of getting used to but improved my range and landings.
If you are swayed by the narrow (minded

) board brigade then make sure you try try try first...