Hey Ryceman3,
I love this thread - thanks for starting it.
I think your Trident Maple forest is progressing really well - nice and dense and I love the way you are keeping the trees shorter and under control. I can learn from that! I like the clean lines of your oval pot too.
Your post resonates because it parallels where I am at with a Japanese maple forest that I have under development and also a Chinese Elm forest at a similar stage.
I am going to be joining these two forest Japanese Maple together into one pot
viewtopic.php?f=104&t=25517 and to benbonsai's advice,
I now have some more mature trees to add to it when I re-pot in early spring - this will help me build a time bridge in the 'age' story of the forest...
and
Here's my young Chinese Elm forest (that will soon get a clip) and that will also receive a similar number of trees to be added to it in spring when I repot ....making it all denser.
IMG_4283.jpg
to which I will add some of these in spring
2016 Seedlings)Chimese Elm 2.jpg
(
Apologies for the spelling of that attach file ... 
)
Of interest ... all of the Chinese Elms and all of the Japanese Maples (with the exception of the old one on the middle of the forest) ... are all seedlings that self seed from trees in my courtyard at home. Lucky.
Your Trident progression and the comments of others are helping me understand my progression too.
Thanks again ... it's a feral day here in Melbourne, so good to be on the forum ... wine at my side.
Cheers
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Tending bonsai teaches me patience.