I've been using smoktech 3.2ohm punched cartos in the tanks and firing at 4.3v. Seems to be the sweet spot for me.
I hope my math is correct... I play around with some VV stuff and on my reos I know what I like so I don't calculate this stuff anymore. But wattage = (volts times volts)/ohms. So you like (4.3x4.3)/3.2 = 5.8 watts. LOL, thats about what I like.
With your reo you'll probably be around 4 volt-ish, someone correct me if I'm wrong. An ohm rating of 2.6 or so should get you close to the same as what you call your sweet spot. But with a non-vv device the voltage does change somewhat over the life of the charge in your batteries.
If I read correctly the clear cartos on reosmods are 1.5ohm. With a 4 volt output from your batteries that'll come out at about 10 watts. That should be a little hotter than what you said your sweet spot was. But, by all means, give one a try. You might like it. 1.7 to 1.8 seems ideal to me when I'm not all wound up on the math involved. I can't explain the difference.
That's one of the cool things about the rebuildable atomizers - you can tweak them to be ideal for you. And you can adjust as you want without having to buy new ones. They're tiny to work with though. And risky. If you check out any vendor, they all put up all kinds of disclaimers about risks involved. Shorts and things like that.
I'd experiment with what you got and see what you think. You'll come to love the reo. I have a darwin, an old buzz, and one the the groove vv devices and I almost never use them. I own multiple Reos

Dripping, refilling cartos, etc is too much hassle. Squonk and be happy. Comb thru the stickies here. There is a wealth of information. This is the
most important post in this forum, IMO. And this is the friendliest/"most helpful" bunch of people you will ever meet.