Havnt really got the time to test the Samara Tree myself.
I think I played the ACG build once.
I actually like the Samara Tree and the "interesting" ways you can misuse the Wall of Thorns.
Seedling Pods can cast Wall of Thorns in any zone bordering it. As it deploys in deployment you can pretty much auto push them without them being able to do anything. [mwcard=DNW01]Bloodspine Wall[/mwcard might be almost as good.
That strategy would require a lot more dissolves, rusts and some anti-battleforge messures like 3 surging waves combined with Hawkeye and Akiros Favor. It means going forward early with your Druid so even a Battleforge might be good.
I still like your other option trying to lockdown your opponent with Tanglevine/Stranglevine and then let your Vinesnappers etc have a go at him.
Id recommend switching between does two and actually adopt some of Mysterys idea from Vines Everywhere and or Poison in the Jungle (which are both real good vs high armor)
Having 3 different ways to play your Druid makes it harder for your opponent.
Other stuff you could remove to get room for some of the stuff I suggested:
Force Wave hmm I don't think it fits in this books. You cant push your own creatures and your more likely to push a bunch of creatures away from you, were you really want them in the zone with you non-movable plant.
Tarok - I think hes to pricy, besides your doing good vs flyers already.
Harmonize - nope - a mana flower instead - that's 1 spellpoint.
Id also cut Veterans Belt as you don't really have that much armor
Hope you find some of the usefull