Hello,
The damage is not x1000. It is technically listed as "+1000%", which I believe is meant to mean "1000% damage. This is a x10 multiplier, not a x1000 multiplier. As such, you will not see nearly as noticeable a change as you might expect.
Additionally, the recent update to this game mode has increased the defense and resistance values of the enemies by 2-5 times, which is why you are having a hard time seeing a difference between this game mode and others. To get a better gauge of the difference, I would recommend comparing the damage of your relative attack type to the non-boosted attack types within taht trial. For example, examine your Chase damage in trial 1 against your standard/mystery damage and you will see that it has indeed been greatly increased! The goal of these trials is to test damage of a specific type more than overall damage, so it is the damage compared between these types that matters.

I am sorry to hear that you are upset by this update. :( Please rest assured that it was necessary to fix some issues with the damage of these trials, and that the devs are most certainly not attempting to push free players out of the game. Free players can still achieve maximum rewards in these game modes (I am in personal contact with a number of free players that are doing just so), but this may require updated or better teams. If you'd like, we can help you with optimized teams in the strategy section of this forum or on our official discord. Please feel free to stop by and get some advice!