First off, if I ramble, forgive me...awake 43.5 hours at this point.
I'm right there with you. In my version, I leave the cluster size at normal, but I have the grow time a little higher than you...I usually get to harvest roughly a season and a half after planting. I'm real tempted to try for the 2 season+ to get some satisfaction.
I talked about farming a bit back in
http://www.bay12games.com/forum/index.php?topic=6224.0Not trying to hijack your suggestion, but the glory of hyperlink must be utilized.
Decreasing the yielded stack size will make barrels a bit of a pain, since 1 plump helmet (5 drinks)and a stack 5 plump helmets (25 drinks) both make one barrel of wine. Perhaps when stack handling/combining is implemented that can be avoided. I think I am going to set mine to 3 and see how that works.
I see where you are going with the 3x3 plot idea: I assume you intend for the farmer to have to work all 9 tiles (thus 9x the labor to plant one seed). My only objection is I like neat little gardens made of single rows.
As you can see up in the linked thread, I am for increased need for water. In synopsis I think the planting task should require the planter to irrigate the plot with water (via bucket). This makes in necessary to have water close at hand in order to complete the task efficiently. Further, to even reduce the yields more, the farmer may have to continue to tend the crops at set regular intervals (water it again or complete a tend task on the tile), otherwise the plant will die or yield less.
My approach does away with mud all together, and lacks that old skool flood farming feel, but with a little tinkering even that is compatible.