Start with no spoilerons, see how adjusting your throttle and elevator change the plane.

The easiest way to Harrier is without spoilerons - as long as your particular plane doesn't want spoilerons.

I was using spoilerons on my CapX, and I could not get that bird to stay steady. After talking to Chip Hyde, I adjusted my elevator throw and turned off the spoilerons, and what a nice Harrier that plane does now!! REAL low, and steady, and without the use of spoilerons recovery is much cleaner.

On the other hand, my Midwest Cap needed a full 1/2" of spoilerons to Harrier.

Some advice -- make sure your engine doesn't overheat. In a Harrier there is less air flow thru your cowl.