Serious Questions About Val

Being extremely honest, I had very little success with Jungle Val. I only had one plant that kept growing steadily, but I had to make changes to the tank and ended up losing it. All the others never grew, some didn't seem to be doing badly but never grew even 1 centimeter, others, however, I more recently realized that they died.

I use Amazonia Fertile Substrate, I used to use liquid fertilizers and liquid carbon but I don't use them now, not that it seems to make much difference. I have a Soma S-1200 luminaire, I also have C02 but I've been told that Val doesn't need injected CO2. I do weekly water changes, pH 7.2, gH ~ 5.5 dgH.

I hope someone knows how to help, I tried to look for some information but it seems that no one has difficulty creating Val, and nothing I found is different from what I do or have done.