Does the Broker innocent increase Bonus HL rewards

The best way is to interrogate a single monster over and over again and reset, though for the sake of the collect all ship parts trophy you should keep any other ship parts collected in their place and go to capture an additional monster.

From my experience in the game, the X-Dimension chests were slightly more likely to have them or other high level ship parts, but they are also far more difficult to collect the part from. If you get a different Flonzor series part, you're on the right track and you just need to keep iterating.

You should absolutely save before interrogating, as reloading a save from after interrogating seems to have no effect on the item in the chest.

Finding the individual P Flonzor parts was actually not nearly as much of a challenge as getting the final body piece. It only took me about 4-5 hours of work to get all of them once I had unlocked all of the x-dimension levels.

It is sometimes not possible to eliminate all geopanels by using the initially provided blocks. However, you can use the geo change ability to randomize them and hopefully complete the change with the new layout.