Dave,

What he suggested is to use the servo trim feature in the radio to adjust the control surfaces to get the trim tabs set back to neutral. I've used your radio but I cannot tell you where in the settings it is so I'd suggest breaking out the book. It's called sub-trim

There really is no benefit from doing this. It's really no different than just leaving the trims where they are. All you are doing is moving the settings from one part of the radio to another.

Also the radio you have should be the JR XF421EX and if so it's a computer radio so it will maintain all the trims for you.

So what it boils down to is I'd leave it as it is.

Back when computer radios did not exist, it was common practice to mechanically center the trims after the maiden flights to keep the trim tabs on the radio centered. That way it was easy to know where the trims needed to be if you used the same radio for multiple planes. Now a days with computers radios such as yours, it's just not needed