I was going to suggest that CAC4 ask you for that help. Glad to see you still have your sense of humor!!
Here's what I was going to write to him. take a look, add your comments and let him know what you think.
CAC4: Do not get too hung up on getting the exact words right. (well I would lay off the "nice rack" comments unless she appreciates that nice of humor) Just focus on the main point - you love her.
By the way it may not be as easy as you think but I like your attitude!
FWIW I happen to love sarcasm and funny inside jokes. My XH used to say "Nice Beaver" and I would reply "Thanks, I just had it stuffed"
MrsCAC4 may not feel like she is IN on the sarcasm and jokes which is why they feel hurtful to her. It's kind of hard to pull completely back on sarcasm (and CAC4 has a true GIFT) but maybe it can be channeled so both of you feel comfortable.
But what is happiness except the simple harmony between a man and the life he leads? ~Albert Camus