Hi! As I was reading through your posts, I could have written the EXACT same story. Our wake times are almost the same and I tend to put her down at 8pm too.
My LO is about to turn 8 months tomorrow and we are also struggling with the wailing at naps, 3-2 transition and she hardly ever does an overnight sleep of more than 10.5 hours. IIt has been this way whether I put her down early or otherwise (but there are few if no nightwakings) She's an independent night sleeper but lately has started to shriek for less than a minute on put down at nights before settling (separation? who knows?!
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I've had to wake her from naps (she is a chronic 30 minute catnapper but will continue to drowse if I pick her up) and cap the naps in order to fit in 3, but her wake times have extended. We tried a 2 nap day since she woke at 710am yesterday but she cried really hard at bedtime and was up earlier than normal today.
How have things been going for you thus far? I would love to hear how your routine is like now.