Now, I can see that you are not very densly planted at all. At least not what I would consider densly planted. Lots of bare substrate.
I'm not sure that I'd want to have a densley planted tank because more stems/leaves would buffer the flow to some degree and inevitably cause algae outbreaks on some of the other plants.
Then halve your lighting, stop CO2, stop dosing and just enjoy a few crypts. LOLOL... Wait! That's what I did with my 36g and that ended up being a nice planted tank too.
Your stems are also too clumped together. If they are squished like that, the bottom parts of the stems die and you have ammonia spikes. I'd separate to individual stems and replant.
Which plant stems are too clumped together? The reason I don't separate is because I've never really learned how to distinguish between what parts of the plant go under the substrate and the parts that grow above. For instance, If I snipped the top half of my Bacopa, I'd be confused as to whether you could plant that cutting or not.
All of the stemplants are too close together. When trimming, for your case, keep the top half. Those look better to me.
Trim the stems from the bottom and keep only the healthy portions.
Again, I don't know what part of the plant, post-trimming, is viable to be planted in the substrate.
top half
The anubia in the foreground, is that in the substrate? I can't tell for certain.
No it's not. Rhizome is at the surface of the substrate.
Fair enough. Idealy, however, anubias should be attached to rocks and wood.
I see white roots and new growth in the Eleocharis, so it'll survive. You'll need to split the plant and remove the algae. The plant should be planted in much smaller clumps than that. I've received Eleocharis in worse condition in the post, stuck it in a tub outside and that still grew well in my last 8g scape.
I really hate splitting delicate things. I suppose I'm a bit sensitive to 'hurting' or damaging the plant. Again, I'm also a bit confused as to what part of the eleocharis goes in the substrate. From the roots that I can distinguish from the leaves, the roots seem very small and don't act as a good anchor.
White roots - go in substrate
Green leaves - above the substrate. You have it planted in the right direction. You just need to separate it. The plant needs circulation. It'll handle a bit of splitting. If you saw how I split my plants, you'd faint.

I am rough.
For all the fancy stuff you are doing, I'd increase your plant mass, especially since this tank is not old.
I'd love to but I'd end up with either algae infested plants or yellow leaves. I've only just moved a set of bacopa more towards the foreground because it was stopping light getting to my Limnophila (bottom half of the Limnophila went yellow). I'd have extreme anxiety and OCD with rearranging stuff If I had more things to work with as I'd be constantly thinking about the cause and effect of each of my plants positions on other plants.
Should I have separated my Limnophila so it doesn't resemble a clumped bush? I guess that would have solved the problem. I hate separating plants as I have low confidence afterwards as I think I've either planted the cuttings wrongly, damaged them or planted something that isn't viable.
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Well there ya go! Yes, you should have. Also, don't tweak so much and shift things about after an initial planting. I see more tanks get algae because hobbiests can't just leave the tank alone after they've done an initial planting or a heavy rescape. My tank's been running in it's current scape since late December, I haven't touched it, other than to trim. The plants need to get used to their environment.
Sorry, if I'm a bit gruff with you. It's not my intention. I think you should just read a couple of the journals, the successful ones, and have a look at what the members are doing. Why are they successful? It's not always about having a lot of gadgets...
Hope I cleared things up a bit.
Liz