I have used the TRQ300 since June and the TRQ200 since September.
Have caught many yellowtail, wahoo, yellowfin tuna to 95 pounds, striped marlin to 175 pounds, amberjack, pargo, etc. on TRQ300, and lots of the same stuff to 60 pounds on the 200.
Go ahead and use the reel for amberjack!
The fast cranking will get you more bites, and although I have not caught any real big AJ's with it, I have caught several of their "first cousins" yellowtail that were well over 40 pounds with it.
I've also caught AJ's to 82 pounds in the past, so I know what you're up against.
Plenty of cranking power, however, be sure to change the handle to the "outermost" hole position.
It may be that the angler using the "demo model" on the Indy still had the handle in the original position.
Not really sure why anybody even needs that innermost "speed" position for a reel with a high gear ratio.