The problem with voting someone out, is the fish are incentivized to be non confrontational with one another. It doesnt matter if production changes the vote, if the fish believe their votes lead to elimination, they will try to fit in with each other. Personally, I dont find that dynamic interesting or engaging to watch. Although I loved Famous House, I didnt like the constant plotting and whispering that a voting element naturally brings with it. For fans of Big Brother, this is apart of the game, but I dont believe that should be the spirit of Fish Tank.
However, one aspect of voting that is great for Fish Tank is the importance of challenges. If the Fish believe immunity is on the line, they will compete. I think this can be replaced with Fish Bucks or cash. But several hundred dollars is too low of a prize.
Another problem that Fish Tank has had in every iteration is that the "best fish" burns out early. This can be due to a lot of factors but usually comes down to feeling ostracized from the group. This was very evident with Cole and Jon. One of the biggest motivators fish have is TTS. I believe they genuinely feed from positive feedback of the TTS. I think all of the fish should be made aware of their endorsements for this reason.
Fans should be able to endorse who they love, as well as who they love to hate. Both of these endorsements will will essentially mean, keep them in the game. Fish with low numbers of endorsements (loved or hated) should be the ones to leave, or forced in challenges amongst eachother to decide who leave. They wont be playing for fishbucks, but rather for a chance to remain.
I think this way of doing things would lead to very natural protagonists and antagonists left in the final act of the show. Letty and Josie was good, TJ and Shinji was not. Imagine how good Burt vs Simbo could have been. Or if their cell encounter was the finale, that would have been amazing.