I have had planes with too much up thrust on engine(and these were arfs directly from factory), with power nose high loops, w/o power good flying. What I did in the field to determine what was happening was took a yard stick to the bottom of the tail horz stab and pulled the cowl to see if it was Parallel with engine mounts. Mine was easily visible and off about an 1/8". I shimmed it and it was flown with no issues. Its not the best method, but it worked for what I needed to know right then.