hmvt? It can only be Halfmoon or not halfmoon
Halfmoon is defined by 180 degree spread or D formation of the caudal fin. Anything less than that such as vt would not be a halfmoon.
Its kind of hard to be able to tell you if the fins on a VT are good. Simply because there is no show class for VT. So there is no "form" to study from and improve. I believe the "best" would be the spade tail form of VT.
Personally unless you have massive amounts of people who want a VT. This might be a money pit. When breeding VT, you have to remember that people can get them at petco/petsmart for $.99 -$2.00. So you're at the mercy of people in your area because most breeders won't want your fry. If you want to. you could spawn, and control the amount of babies by taking the female out early, and cull hard. That way you end up getting to your personal goal (not entirely sure what your goal for these are it was kind of hard to read) without spending TONS of money on jars and fry food. It will still take alot of time with water changes and culturing food but at least you will have some stress taken off of it.
On all other tail forms
That is a good site to study from.