I am a bit surprised you are having issues with braking. I am 210 before gear and water and have little issues stopping except at really high speeds usually on a mountain trail. I assume you have hydraulic disc brakes. I also assume they don’t need a bleed and pads are good. Assuming all this some brakes have an adjustment to take lead out of them. It makes it where there is not the zone where you are pulling but nothing happens and then as you get deeper they start to grab. You may want to try and make them more sensitive. That is my preference.