14x16 - that's quite a large map :)
The main question is, what to do with the creatures' speeds then?
Added after 10 minutes
In principle, on such a map, you can try these speeds:
3 -> 4
4 -> 5-6
5 -> 7
6 -> 8 (large cavalry) and 9 (small flyers)
7 -> 10 (large flyers)
8 -> 11-12 (top-tier large flyers)