I fully agree. Drop the weight training. I used to lift heavy and now I’ll likely be having a bone spur removed from my elbow as a result. I still hold a ton of muscle mass at 149lbs. You get extensive resistance training from sbr.
Just stop lifting, go for a modest defecit and your body will hold on to the muscle that it needs for training. My target weight is about the same weight/height ratio as the target listed and i don’t look like a beanpole. Without doing any lifting throughout the year i can usually walk up and rep my bodyweight for bench and bb rows, which is more than enough for triathlon.