Any time someone feels like they "have to rush the shot" under one set of circumstances, and not under another set of circumstances, it could be a sign that target panic is creeping in. If you can learn to control this at an early stage, you might be able to avoid the more extreme measures you hear about. I think the best way to control this at an early stage is this:
1. Draw the bow under the circumstances that create the urge to release prematurely, in your case, a longer shot.
2. As you draw the bow, look at the target in a general way without focusing on the spot. When you get to full draw, if you get the urge to release prematurely, look away from the target: look at the back of your riser, the sky, or whatever, other than the spot. Continue to hold at full draw.
3. Don't fight the feeling of urgency or nervousness; instead, embrace it and allow yourself to feel it. After a few moments, the feeling should go away on its own without you trying to make it go away.
4. After the feeling or urgency goes away, focus on the spot and complete your shot.
I have had full blown target panic several times, and know it's always looking for an opportunity to rear its ugly head again. I look at the back of the riser as I draw the bow, because I know that focusing on the spot is one thing that triggers target panic for me. I only focus on the spot after I come to full draw and do an internal form check. If my alignment is correct when I start my draw, I'm usually not that far off target when I focus on the spot, but I usually have to make some aiming adjustment at that point. I think at your stage, you might be able to get away with looking at the target as you draw without focusing on it, which is where I would like to get to myself, and would avoid the last moment aiming adjustment I usually have to make.