You're of average weight even for someone who doesn't lift. So you don't need ultra-caloric intake. So you're on the right track nutritionally.
How about we use the term "fat loss"? Cutting really refers to getting down to some extremely low bodyfat percentage.
You said you're not chubby, and you really don't have to get so darn chubby to put on muscular weight.
It doesn't matter how chubby or lean you are--anyone good at "belly breathing" (me included) can make themselves look like they have a prosthetic gut. I'm actually pretty good at it, and its a desirable thing to do in the squat, bench, and deadlift (hence the term "belly out").
There's nothing wrong with a protein sparing modified fast once per week, and it might be a good idea. I personally wouldn't place some huge leg or back workout on that day--maybe shoulders and/or arms.
You're already on a good track. Why the need for more tips?
(Note to other posters: NOT going into semantics over chubby-fast bulking versus gradual bulking here considering the only damn people who succeed in chubby-fast bulking don't even need guidance in what they do except in some cases where it's time to get cut. I don't like hearing of genetic exceptions or exceptions who inherently knew what they were doing coming out of the gate! Most on here aren't like that, and that's why they have so many inquiries in the first place! MOST men don't succeed in fast/overeating style bulking, and that's that.)