Glad to know the tilt to the left is normal. Should I be able to use the trim to correct it or will I always need to add a right tilt during flight?

you don't have to set the trim for that once you get it airborn it will fly stright.

Please clarify "move the servo on the boom to offset the drifts", do you mean physically relocate the server on the boom? or change the servo horn position?

yes reloacate the servo on the boom

Andy