Tail volumes checked in Daniel Raymer way !

According to Daniel Raymer the twin ought to have 0,8 TVC for the elevator and 0.07 for vertical. I'd be pleased to hear any further info on this..to me the verticals are too big now.

Since I have planned to have fertilazion , parachutist, sight seeing, ambulance and even taxi flight serveces with this I have put more than 0,8 for the elevator too. Edit: Now they are ok !