We use the chicane, what you're referring to as turns 3 a, b, c, 99.9% of the time. Not sure what turn 1 combo you're talking about, I'm guessing you mean how we pit-out? We don't use that first chicane config, pit out puts you on the track before turn 2, stay to the right to blend in, don't hop over to race line when entering the track. We don't utilize the first chicane for pit-out, which has riders entering the track between turns 2 and 3.
This is the way we usually run it. It's rare that we don't use the chicane (turns 3 a-c). The only reason we wouldn't use it is if conditions were such that it was too slick. Doesn't happen very often.