Decor is any decorations... And no I don't think it is Harsh.. Do you want to enjoy your fish or do you like feeding an empty tank

Trust me It works for most every fish.. I just did it with my new baby Pbass growouts

I haven't kept this species as long as some ... But I have had them for over a year now and just like I said got some new ones recently..
Now here is an example... You always here about POOR souls that cannot ever see their fish as they hide too much.... RIGHT?? You are right now in that category
I am not in that category not with ANY of my fish for a over 10 years now...
Your fish will be more stressed the longer you let them decide what and when they are going to do what ever they want! So you pull the Decrations you leave NOWHERE for them to hide and you make sure there is some kind of traffic at least periodically in the room they are in.. And most important YOU MAKE THEM KNOW
YOU ARE THE HAND THAT FEEDS THEM
Give it another month with these suggestions and let us know how it's going

I am thinkin at most 2 months they should be screaming to the top when you get near the tank

And the 2 months is with EXTREMELY fidgety fish
My WILD Pbass I just got two months ago do not hide from me at all!! For now they still have NO decor in the tank. They do have a growout Silver arow who at 7" already eats from my hands and also came extremely SHY!!!
So what do you think do you wanna see your fish or just feed a tank that you don't even get to see EAT

It's worth a try

just a few simple suggestions
This of course is my own personal Experience and Opinion