What are you going for? Quantity or quality? If quality is important, you said it's perfect, I'd harvest now. If you leave it, it will of course get bigger, but your quality of high is also changing.

You have a great bud there, and IMO the extra 2 grams you'll get by waiting another few days won't be work the degradation of the THC. But it's up to you. :thumbsup: