Don't know if I fully understand your question. "I had a couple opportunities that I would have taken, but I was concerned about trajectory." Seems to be a way of saying they were too far away (and you made the correct decision not to shoot). If you're concerned about trajectory, you just have to learn what the trajectory is at the distances you were considering and practice until you're confident at that range.
The combination you're shooting now seems pretty good to me. What you're proposing will drop overall arrow weight to around 550 grains, I expect. Still plenty and it will flatten trajectory some. However, you'll always be faced with the "concern about trajectory." It's your subconscious telling you the shot is too far.
Long(er) shots are more difficult for a number of reasons, trajectory being only one of them. Much more difficult to "pick a spot" because the critter may be too far away to decipher detail. Distance (for the subconscious) is also more difficult to judge. The critter's size has a greater chance of misleading the farther away it is. And so on.
Long story short, you did good. Passed on shots that were beyond your range. Practice and experience are the best way to increase your range. Just keep at it. Of course, the other goal should be to get closer. Good luck.