"Utilize" first arose in 1807 if Merriam-Webster is to be believed, well past the period you're quoting; and "dost" should agree with the number of its noun "senses". ("dost" is second-person, but you need something third-person.) In this context I also don't really like the continuous present of "are you utilizing", but I can't put words to why. I believe "hast thou taken leave of thy senses" is actually recorded to be idiomatic.

By the way, ChatGPT suggests (where I've fixed its analogous error in the word "doth"):

> Pray tell, wherefore dost thou employ the term 'contrariwise'?