You'd be smart to explore perfectly balanced ratios and micro dosing. There are some excellent balanced strains out there. Maybe a hybrid with 50/50 indica/sativa too. You have a very sensitive system and you deserve the benefit of a nice, balanced euphoric experience that doesn't make you that loopy. You're gonna take some creative tweaking, aren't you? Lol!
I am, I have a ton of seed strains to choose from. This grow I went with the ATF, which was amazing with my back based on the stuff I purchased at the Tacoma dispensary. I haven't smoked a lot of variety, but i liked the high when I took it in smaller doses (its a sativa dominant variety, I have seen ATF seeds where they are indica, but the indica knocks me on my ass). I also chose blueberry based on reading good reports of it as a pain killer and helping with the back. I selected the Blue Kush which is a 60/40 sativa dom strain to try that balance that you speak of (hopefully with the medicinal benefit of the blueberry that is mixed with the kush), and then I selected the Durban Poison for just the high, supposedly an energetic type of high (might help do some garden work when my back isn't bothering me too much).
Next grow I am going to go Northern Lights (heard good thing medicinally), Blue Dream, Girl Scout Cookies, a CBD strain that I haven't chosen yet ( have about 10 to choose from) and then one last strain that I haven't decided on yet, though I looking for a good hybrid that is close to a 50/50.