Yeah I wouldn't trim the fat... It is still by far mostly good saturated fat, and that's our energy source on the PB. You can't get the most out of PB if you're eating too lean. Fearing the fat in grain finished beef is not justified, assuming the beef is still conscientiously produced and not conventionally farmed.
Just make sure to eat fish too, and take an Omega-3 supplement. Grass fed/grass finished is best. But we need Omega 6's too - it isn't like they're toxic, necessitating avoidance of all Omega-6 sources as if they were gluten. People forget that sometimes.
5'6" Female, 29 Years Old, 260/195/120
"Discipline is choosing between what you want NOW, and what you want MOST!"