"Snap" Wexley ability says: "After You execute a 2-, 3-, or 4- speed maneuver, if you are not touching a ship, you may perform a free boost action". So, It's possible to perform 4 actions in this sequence: "Snaps" with Push the limit and BB-8.

Declares a 2- or a 3- green movement. Triggers BB-8 and performs a Barrel. (1st action), triggers PTL and performs a, for exemple, a focus action (2nd action). Then performs de maneuver. As a green maneuvers, takes off the tension. Then triggers Snap's ability and performs a Boost action "3rd action", and finally, performs his action, for exemple a Target Lock.

4 actions, no stress.

Is it correct?

Looks fine to me.

Sounds good and very effective to get boost, barrel roll, focus, and TL.

You could stretch it to 5 actions with seismic torps and experimental interface ..... you probably wouldn't want to but you could

Probably wouldnt do it every time since the boost might rocket you off target but perfectly legal.