How sweet of you to think so!
Of course, testing is the only real way to know what's going on, get the ultrasound if you can, but we know our cats well, and I am sure Julio is keeping you informed in his own way.
It sounds to me like you both want to give split dosing a try - I would wait until the month is up UNLESS Julio looks like slipping back - start then, and again wait. If you can't get to a month without frightening yourselves, then I'm afraid it's back to daily treatment, and move up to 1M. And lets face it, it's better than the alternative, isn't it? You can try again after a while on 1M.
You have done really well with Julio's treatment, little kitty must have a strong need to stay with you!
Keep in touch - email me direct if you like.
Love & light to you both
Clare