@Doscab - I'm trying a something a bit different with this peach/vanilla mead as far as the 'peach' part goes. I'll elaborate on that in a different post (maybe the mead log) later, but to answer your question, I'm doing a little peach in primary, and the vanilla in secondary. My thought is that a little peach in primary will provide a slight peach nuance, but hopefully some good aroma. I'll then add peach in secondary to hopefully get the peach nuance I'm shooting for. My guess is a little malic and/or citric acid may be needed to make the peach pop a bit more (maybe even some lemon zest, but not enough to get lemony). I was searching for just pure peach juice and noticed many of them had lemon added to get the peach flavor to pop. It's so strange because anyone who's had a good, juicy, peach knows that that great peach flavor. I'm going to have to be careful with the vanilla. I'm going to use some grade A Mexican vanilla beans in secondary, but I don't want to overpower the peach. I also have some home made extracts of other vanilla bean types that I may supplement with (Madagascar, Uganda, Ecuador). I plan on using French oak cubes in medium toast as well.
One of my first batches was a peach-vanilla mead. It was good, but it did need more 'peach', and I think I kept the medium+ American oak on it too long.
I'm about ready to rack out of primary, and both batches (each with a different yeast) smell great - still holding on to a slight peach aroma, so there's hope

.
@Doscab and
@Chevette Girl - I'm a bit more than a backyard beekeeper - more of a side gig and hobby since 2014. Maintained up to 17 colonies at one point, and downsizing now as it was too time consuming and I'm not retired, so the 'real job' has to take precedence.

I've never stopped learning, and still make mistakes. I use my honey as well, and this year wasn't the best flow, but every year's honey has always been a bit different. This year's harvest seems to be more fruity, so I figured it would be a good year to try the peach-vanilla again.
@Chevette Girl - I typically have to rinse cappings at least 3 times to clean them enough for any beeswax processing. The water always smells so good. I've drank some before too! You're likely thinking this already, but I would recommend treating the rinse water from the cappings with some k-meta before using it in mead. I would imagine that the risk of all kinds of 'baddies' to get in that rinse water is very high. I've seen capping water start to ferment from wild yeast. I'm not sure how you're set up for harvest, extraction, etc., but it typically isn't the 'cleanest' water either, so maybe a rough filtering may be needed too. All that said, I'd be interested in what you do with it for mead and how it turns out.