Its my understanding that the 10% to 15% rule is for babies and juveniles ad the snake grows you should move down from 15% and as an adult it should probably be less than that. I would and did feed my 50 to 500 gram BP 10% to 15% of her body weight. Now that she is over 600% I am shooting for 10% with 2 mice every 7 days and she is only taking the second every other feeding on average. I breed my own mice now so up until now its been easy to get the right size mouse. My mice top out at about 30 grams so its time to switch though.

Back to the original question though, I don't think a 2500 gram BP should be getting a 250 to 375 gram rat every 7 days. As an adult your snake is not growing as much as getting fat, so you should pull away from the 10% to 15% and feed an appropriately sized rodent. Then you can adjust your frequency of feeding or quantity you feed to match whats healthy for your snake and in keeping with your plans for your snake.