Hello again Kyle,
I posted in the thread you put up when first starting the 55g converting from the 10g. Read back through all 5 of your threads before coming back to this one. Things are better but still having issues. No biggie in my opinion just growing pains as you learn.
Still as folks have told you to much light and not enough CO2 = BBA.
I realize less light energy = less nutrient uptake and NO3 levels are a problem for you.
The holes in the leaves, leaves thinning and plants not growing can be a lack of potassium (K). Without the needed balance being available (NPK) plants really can't make use of only one without the other two.
All sword plants are heavy root feeders and either enriched substrates or adding root tablet ferts can really make for a change in growth.
10-30ppm NO3 (fish load seems to be providing this) I change water reaching NO3 30ppm or based on rising TDS on all my 'low light' tanks.
2-4ppm PO4 (KH2PO4)
15ppm potassium (K2SO4)
These are my goals for the range of value in all my tanks.
Potassium tests are either very costly or not worth buying, I don't test for it. I dose dry weight for 15ppm once a week and watch for results.
Lots of simple, direct information for those starting with dry ferts can be found on Grumpy's old site. (I started there)
Get the needed minerals in the water, add a few tablet ferts around the rooted plants and don't be afraid to change the water once every couple weeks. I read where you posted buying a maxjet 900 power head. Is it in use to aid with water movement? Using the air bleed on the power head to add atmospheric O2 and CO2 can help maintain steady values.