I'm not a Retic guy, but I am aware of someone in my state who was once possibly the largest breeder in the country and he used to have estimates of size based on dwarf/sd percentage, male or female, feed schedule on his website which is now down for rebuilding......you could always send him a message on Facebook and he's pretty friendly from what I can remember of talking to him years ago. He's mainly into Monitors now but I think it would be worth your time to get in contact with him and ask. Tell him what you have and he'll probably give you a very good estimate. Kris is the name I believe.
https://www.facebook.com/vitalxreptiles/
Me personally? Bigger the better. Just keep in mind you'll be safe due to the fact that you don't have a mainland Tiger female though.....I swear they are the largest ones I see consistently online.![]()