Hi all. I'm experimenting with a longer draw length, and I'm looking for an opinion on arrow length. Here's a pic for reference. If I can get away without buying all new arrows,obviously that's easier on my budget.

Me too. While conventional wisdom would say for broadheads your arrow ideally should extend about 1" beyond the shelf, the risk where your arrow is extremely low, especially if you're someone who flexes (tests) their arrows frequently.I'd shoot either off it....your fine.
I would not argue with this. "Smart" is always better! The mere fact that you've posted this question shows you understand the risks involved, and therefore might be better not shooting these arrows if it's going to hang on your mind during shooting. However, in your pic, the end of the arrow is barely behind any part of your hand. This makes it very hard for an arrow going forward to catch your hand. Now, the overdraw, that's a different story. I would never fire a broadhead off of an overdraw.I would not shoot BH at that length. I want all my fingers. Maybe I am overly cautious or maybe I am smart. I don't know. I do know I took a buddy to the ER years ago for stitches from a BH that sliced him while shooting. Also, I like the added weight. Never too heavy an arrow for me.