i'd say yes, too long.. but your gun may tell you different.
i've used MMP HPH24 sabots with 250 grain XTP's, and its a similar problem - petals too long.
try this test - trim a number of the sabots with a pair of fingernail clippers - i use the post in the clippers as a stop, and trim them all the same length. shoot those and compare to results with untrimmed.
basically, the petals only need to be just a few thousands of an inch beyond the start of the shoulder of the bullet.