When does your employer ask you to go on the trip? If your like me my employer asks me the day before and I just take whatever is left regardless if it is a Tango fare or Executive First. Also my flights usually originate in an airport with only 2 major airlines serving it and all my flights are transcon so it doesn't really affect me. I would say if they're giving you last minute calls to work you should usually avoid Tango fares all together.
PS: Welcome to Flyertalk.
