needhelp. is your pump deep well or submersible?
A 2″ casing sounds awfull small for either, given that the deep well injector head will be more than that & a submersible will have trouble as well.
Why dont you engage a professional, after all that is their proffession.
If your pump is working overtime to do the job, you will find the cost of the professional a cheap alternative to a new pump.