Premiums, co-pays or both on the insurance? 401k is a sticking point, but if you can adjust your budget to compensate it isn't necessarily bad. (just pray Trump is re-elected or you're fucked) you shouldn't need legal benefits. If the new job is a shorter commute and better environment it might be worth the switch, particularly if it adds to your scope of work skills.
Seems like a your call kind of thing, but I wouldn't go backwards in job title or responsibilities, you need to be adding to that now.