I have played this format the once a few months back, thoroughly enjoyed the amount of time you get playing.
There was a few teams back then that got dominated due to the different level of play, there was a BIG difference between the teams. Those that were held back stood no chance of getting back on field.
The game is suppose to be fun, have plenty of trigger time, those that were being held back certainly didnt get much play or the amount of fun other teams had.
As it is hard to mix and match teams to play on the same level or similar level, i realise there will always be games where teams will no doubt have trouble getting back on field.
A suggestion is, why not pause the game at this time in point for say 30 secs, both teams back at the start gate and game time resumes.
Point wise, the team that was domination gets an extra 10 points etc, or team that was being dominated and couldnt make it back onto field get deducted 10 ,points etc.
Its not something that will happen in every game, but that way at least every team will get a good amount of play, rather than being stuck in the pits for the remaining 5 mins of there game time, neither team would enjoy it if that happened.
ps, need to get F5 up here in the midlands please