Best is if you shoot properly spined arrows for your bow, rather than trying to get your arrows to impact more right by changing the spine. That said, I think 55-60# arrows are too stiff for your bow, so going to a weaker spined arrow might help your arrow flight and also move the point of impact to the right. I would suggest 50-55# wood arrows, or perhaps Gold Tip 3555 graphite arrows, cut to 29", with 125 grain points.
Once you are shooting properly spined arrows, you should hit where you look, if you are shooting with proper form, and if your arrow is lined up underneath your dominant eye. I assume you have checked, and your right eye is your dominant eye?
You can tell by the arrow flight if the arrow is under your eye. If the arrow is to the right of your eye, it will appear to fly to the target from right to left, rather than straight at the target. I doubt if the arrow is to the left of your eye.
Proper form means that you are properly alligned, coming to full draw and holding the string with a relaxed string hand and string arm. If your shoulders are alligned to the left of the target, your arrow will tend to fly to the left of the target. If you are not coming to full draw, such that your string forearm is in line with the arrow, viewed from above, then your arrows will tend to fly left, because your string forearm is pointing to the left. If you don't have a relaxed string hand, such that the back of your string hand is flat and you are taking the weight of the bow with your back muscles, that can also be a cause of missing left (or right, or high, or low, or just generally not hitting where you're looking and wondering why).
The reason you are inconsistent when you delay is because you are losing back tension and letting your arrow creep forward. If you increase back tension throughout the shot, your accuracy will improve if you hold before shooting. Not that there's anything wrong with releasing as soon as you hit your anchor. You can shoot reasonably accurately that way, just not as accurately as if you hold for 2 seconds.