LG Drilling vs PT'ing

I've done close to 12 PTs in the past month and I've noticed that my LG score varies significantly than that of my drills. Usually when drilling LG I can get anywhere from -4 to -0 on a cold section. However, when taking PTs my LGs are awful ranging from -4 to -8 in some cases. Does anyone have any tips on how to close this gap ? I think I'm decent at LG but for some I just cant rely on it during an actual PT.