well, any squating is better then no squating so you should definately go to parallel. and yes that is probably flexability issue, you should start streching before your lifts and eventually you should be able to go A2G and get a better workout. although you wont be able to do as much weight itll be worth it to do them A2G instead of parallel. personally i still go down to parallel when i 1RM because its easier to do more weight and if i tell most of my buddies what A2G is the look at me like ive got 2 heads. lol.

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age: 18
height: 5'9"
weight: 198bs
bench 1RM: 275
parallel squat 1RM: 385
deadlift 1RM: N/A
hang clean 1RM: N/A

i wish i could live on crack and protien shakes...