EI booking SNN to LAX

I booked SNN - LAX ages ago. I now have been advised that due to a schedule change I have over 5 hour layover in BOS. Flight is due to land in BOS at 16.10 and the LAX flight I was originally on moved to 22.02 departure but they have one at 1700. I have asked but they won’t move me. My question is EI135 almost always lands at 15.30 approx. Would I have any chance of asking Jet Blue to put me on the 1700 and avoid a 5 hour lay over when I arrive in BOS or do I forget it as the bags are already tagged for the later flight? EI have refused to change the flight blaming Jet Blue for schedule change.