Definitely adding grypolyth to the team after the next boost shuffle (barring major changes in the next update), and I’m also thinking about this. From what I’ve seen, most people aren’t adding any more than a couple speed. I’m seeing 20/10/0 and 15/15/0 being used successfully. 17/13 would give you 7274 health and still 2013 attack, so might be a nice “middle ground.”
I guess just figure out how big of a hit you need to take and how much you’d like to heal, and go from there. I wouldn’t waste much, if anything, on speed. With a base stat of 106 you’re not gonna get faster than much anyway. I could see maybe two speed to outspeed dio and get the shield up before it can attack, but trying to outspeed base magnus (114) or whatever is just a waste.