We have no plecos in the tank, and supposedly the nerite snails won't snack on the plants. The platys and cardinals pay no attention to the plants aside from using them for cover.
Usually nerites will not bother plants much, but they can and do damage plants. The holes on your plants are nerite damage.
Here is another plant that nerites ate to pieces:
I'd be surprised if the bulbs were an issue. The plants struggled when I first put them in the tank. After I switched the bulbs that came with the hood with the 50/50 bulbs, the plants started to thrive...perked up, started growing like crazy, etc.
Not saying you can't grow plants with a 50/50 bulb, just telling you that your plants can't use 50% of the light the bulbs provide. 50/50 bulbs are specifically made for saltwater systems for algae and coral which can use this wavelength. You have 10 watts of usable light above your tank due to the non-actinic part of the bulb. If you want to give your plants the most light your fixture can provide you should get two bulbs that are around 6500 K
Here is a link to a discussion about 50/50 bulbs for freshwater plants if you are interested:
From the pictures you uploaded, if we ignore the holes as symptoms (nerite damage), then we see older leaves are going pale and show signs of necrosis along the edges and tips of the sword plant. This can be one of two things, a nitrate deficiency or a phosphate deficiency, they both look fairly similar. Nitrate deficient plants generally tend to grow progressively smaller new leaves which the sword in the 3rd photo seems to be doing. This is strange because you say your nitrates are at 80+ ppm. Phosphate deficiency shows similar older growth necrosis around the edges/sometimes the tip of the leaf and normal sized new growth. So, the signs your plants are showing are a little ambiguous.
The Ludwigia in the front has some small new leaves and some dead growing tips along with slightly damaged older growth. This also looks more like nitrate deficiency than phosphate deficiency.
I'd take a sample of your tank and your tap water to a local fish store and ask them to test it for you just in case your nitrate test kit is off.
If the results are the same, then you'll need to add some phosphates and see if the plants respond.
Also, remove the nerites if you want them to stop gnawing holes in all the leaves. People claim they don't hurt healthy plants, so perhaps that is true and they are just eating the plants because they are suffering from a deficiency, but I have my doubts. There are many species of nerite snails and they can't all be totally benign.