The truss rod adjustment is something you can easily do yourself. Lay the guitar down with the headstock on the left. Look at the space between the neck pickup and the end of the neck - you will see a ring with some small holes. Stick an allen key or something inflexible in the furthest hole and turn it no more than a quarter turn towards yourself. This will add neck relief. Retune your guitar and test it. If it still needs more, repeat one more time. If it's still buzzing, you may have a bigger problem and might need to return it.
As for the feedback, is this because you have the JP15 set in piezo mode? Is the switch on the upper horn down? If it's up, that means you are only hearing the piezo pickups which would certainly cause terrible feedback with a lot of gain.
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