It's fine.  Like I said, it should only require a small change on the last obstacle.  That said, reading over the rules you posted again, automatically succeeding on the first try with magical aid is worth -1 delay score, right?  Does that include the Polymorph spell that I used?  Taking on the form of a Girallon allows Dask to succed on the bull rush check in the trapped alley thanks to large size and brute strength, and the climb speed allows him to climb past the rolling log and rope bridge, as well as the final rope climb at the end, so if that counts as -4 delay, he'll end the course with a total delay score of 0, tying for second place with one of the NPC contestants.