This question is asked here 5 times or more per week.
I'm not at all concerned about a 300+ gram snake not eating for 11 days.
You do realize that depending on when you got him in February he has gained 125 ish grams or over 50% of his body weight in 6-10 weeks depending on when you got him.
Skip the feeding and just try again next time.
My never fail trick is that I wait for 3 consecutive nights of roaming around and hunting. Every night it will start earlier and end later, so if you note what time they give up the hunt on the second night, I try to feed mine an hour ahead of that as he is normally out quite early on day 3.
Snakes in captivity are over fed, snakes in captivity are obese. So, you're doing just fine.
Same thing I say to everyone. Don't be upset when the snake doesn't eat on your schedule.