I would be very cautious, you have already extended your tail rotor diameter by 2mm, extending the main rotor disc dia. by an additional 6mm would be extremely close if my 450L is anything to go by.
I've replaced the standard 61mm tail blades with 69mm tail blades and now the clearance with 360mm blades is about 4mm.
Using a tape measure 386mm from the center of the blade bolt to the nearest point of the tail blade disc arc, that will give you an indication, this is not 100% accurate so give yourself some leeway.
It should help you make a decision though.