You're doomed...certain things you cannot change. You want to go deeper and stay longer but still within your NDL. I think one agency...not sure if it is IANTD, does offer a rec trimix course. Having said that, as the name implies, I think their max depth is 140 ft.
By the way, at this point,you have only addressed one part of the problem...yours. How about your diving buddies? Unless they equip themselves with larger tanks and take similar course...they will always be going back to the surface first as they represent the lowest denominator.
By the way, at this point,you have only addressed one part of the problem...yours. How about your diving buddies? Unless they equip themselves with larger tanks and take similar course...they will always be going back to the surface first as they represent the lowest denominator.
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