I've gone full STR, continued throughout the coils as full STR, and swapped 6 points into DEX after clearing turn 5 merely to ease my concern about missing a butcher's block once.

As mentioned in my guide the actual "gain" from stacking either tends to be negligible anyway you cut it. Vit favors encounters where you end up moving or focusing less on your rotations and more on positioning and STR favors encounters where you're free to stand there and smack a boss up, slightly, with the trade off being 600 hp your healers have as extra to be responsible for or STR's 490 hp when your pool is over 8.2K regardless in regard to the 20% self healing burst with VIT compared to the 22% with STR.