Montrachet would work (it's yeast) but I dont think its 'ideal'.
Never used it myself so I cant say much on what it could contribute good/bad to a peach wine.
71B-1122, D-47, K1V-1116
All decent yeasts for Peach IMO
Most people focus on keeping a yeast from stressing, when that's only half of the game. ABV Tolerance, H2S creation, SO2 Tolerance, pH/TA tolerance, nutrient needs.... This is all tied to keeping the yeast from stressing and its about 90% of the conversations you'll find on the forum about yeast.
People tend to overlook the sensory impact the yeast has on the wine - the changes it brings to flavor, mouthfeel/body, and aromas. While keeping the yeast stressfree is important for the fermentation itself, 90% of a wines life (& the whole reason we make it) is in the flavors, textures and aromas we sense when the bottle comes 'of-age'.
I know I might be 'over your head' here, but I mention all of this simply so that when you get to the point where you can choose a yeast for a wine-must and it fits the fermentation parameters correctly, that you dont think "I'm done learning about that".
Once you can toss a yeast in a must and nail it on the "ABV Tolerance, H2S creation, SO2 Tolerance, pH/TA tolerance, nutrient needs", then its time to start learning about yeasts for their "flavor, mouthfeel/body, and aromas".
When you can match fermentation parameters & the sensory impact of a yeast on the wine, to the wine you're making - then you're REALLY gettin somewhere. Thats when the real fun (and notes) starts !
I lost about 30 percent on peach, and about 40 percent on mango.
These are awfully high percentages, probably related to your early-tossing of the lees. You shouldn't lose more than 15-20% on any given batch, solids-excluded.
I lost about 17-18% on my first batch of wine, Peach, when I didnt know to/how-to conserve lees.
Patience is key.
Rack the lees to a separate container/carboy/jug and allow it to settle.
Recover the wine.
Example here