Just to be clear-- the Picos, including the dual, will not work with your tank. I believe all of the Picos max out at 22mm. Someone can certainly correct me if that changed on the Pico Dual but it sure doesn't look like it.
I agree 80-100W is probably enough for headroom, and batt life will be good and long if you usually vape at 50-60. There's no particular harm in getting a mod that is capable of more power than that if you like it and can afford it, even if you don't ever use the higher wattages. Battery life will just continue to increase if you're only using a third of the possible power instead of half.
The only downside to the 2/3 IMO is that it maxes out in 6V in 2-battery mode. There may be a legitimate reason for this, and 6V is still high, but it bums me out that a 1.2 ohm coil maxes out at 30W in 2-battery mode because of that voltage limit (for example). This is less of an issue with lower-ohm coils that you're more likely to run at 3.5-4.5Vish, and most of the coils for your tank will indeed be lower ohm.
Besides that and the slightly fiddly 2-battery enclosure (the 3-battery is better with fit), it's a great mod, period... but especially for the price.
I still highly recommend taking a look at the HohmSlice, too, especially for $30. (Vaporcube.com code: SLICEPRICE) I actually think that's a perfect solution with your parameters, and if you want to "upgrade" your experience in the future, the Slice does things that no other mod can do besides the same company's other big device. The only thing you may not love is the fact that it's a single 26650 with no option to use 18650s. I wouldn't normally be pushing such a complicated device for anyone who wasn't specifically looking for it, but it's not complicated in power mode, it's on a fantastic sale, and if you decide to go that route I'm more than happy to make myself available over private messages for questions.
But I definitely support the 2/3, too!
EDIT: The Hohmslices have been removed from the Vaporcube site, at least for now
So... RX! I'll check if I can find the Hohmslice anywhere else, but a big part of my recommendation was the 50% off sale.