i've seen some decent "fortress" locations (well, that''s what i call them anyway) with 2/4/2 and forest. i think there needs to be a shard or crystal resource next to a tile that also happens to be next to a forest for this combination.

i typically see a 4/3/2 (or slightly weaker variations such as 4/3/1 or 3/3/2) without forest/river for my starting location so i guess there might be a script that places the starting locations in such spots (or the other way around - replaces the designated starting location tiles with yields to generate this type of tile)