Given the initial information you posted, I think around 100-110 underfoot would be good, maybe on the lower end. 170 might be a little short, maybe go 175. That partly depends on brand though, if you get K2s go a little shorter because they measure differently. A K2 169 is like a 175 or so from pretty much anyone else.
I mostly just ski fat skis, so considering you want 100-110 I don't have any specifics to recommend. Given that you want soft/playful over powerful/aggressive, I would avoid getting another pair of Volkl, because from my experience they're stiff aggressive skis (though I haven't skied many Volkls). Dynastars, same thing, they tend to be very stiff and aggressive.
I like K2s a lot and they tend to be a good balance, pretty aggressive but still playful enough, but maybe still a little stiffer than you're looking for. You could consider the K2 Shreditor 102. However, my opinion is a bit biased as I personally really like K2s. They're great skis for my skiing preferences, but may or may not be ideal for you. Worth looking into at least. With the Shreditor 102s you would definitely want the 170s (the smallest size they come in) because they will be like 176 or so from other manufacturers. Not sure how Volkl specifically compares in measurement.