So I have a 400 gallon system and have had many tangs and here is my usual stock list, what is current, and complications I have had.
I know have a:
Hippo
Sailfin
Stripped Bristol tooth
Vlamingi
Barriene
Others I have had with this group for longer than a year were
Naso
Yellow tang
Scopas
Purple tang
Powder blue
Powder brown
White cheeked
the problem I encountered was my vlamingi was 6” large than my naso but the naso would not leave him alone so eventually he was chased out of the tank because the vlamingi had enough,
My yellow, sailfin, scopas and purple were fine for a while until they were full grown, best way to discribed how it looked is they were the size as small dinner plates. They were fine for years but once there was no algea in the tank and a lot of fish are nori, the scopas was beaten to death and the yellow and purple got ick and died.
same scenario with the powders.
mad small fish they have room to swim and grow but my lfs said it right. They are not friends, they are overly aggressive roommates with a huge diet. The odds are high that the tangs will fight just because of the territory and food consumption. The would cause stress and then ick. I personally have decided stick with what I have and call it a day.
in regards to your list I would say start with the kole or lavender not both, and which ever is most important to you