I think as a general rule (in the UK) if you are on TP's then its a case of being stuck there while all the PTF people jump over you on to the jets. So, I think staying on a jet, in career terms is a better option.
If you made the move to scheduled TP's would your quality of life be any better? If Flybe is anything to go by, the FO's don't have much quality of life.
Depending on your age and circumstances I would be inclined to tough it out where you are while constantly keeping your eyes open for an opportunity as a DEP on jets with BA or any other reputable outfit. I have met quite a Bizjet drivers who are very happy with their lot, but a lot of time away from home is normal. Best of luck.
PS if you are young enough, retrain as a lawyer/accountant and have a less exciting job, but a life!