Great looking squats Mike! You got the pauses right, hold that air in the hole! If your not losing your air under a 3sec pause squat, your not going to lose it with your big meet squat. Your core will NOT cause you to miss a squat! I can promise you that much
FYI: If you listen to what the guys in my last squat video are yelling at me, they are talking about getting that air into my stomach and holding it there tight. I honestly think that is one of the biggest parts of squatting. Being able to control the weight with your core is huge!