If we're assuming the absolute best situations, Spear of God and Summon Golem are both trumped by Smash and GFS.
Capped Str + Str from Trans + Maxed 2H Ego is around 450 Max. Toss in enchants and you're over 500 Max.
x 6 (Smash) x 2.5 (Critical) x 1.31 (Music) x 1.3 (Attack Potion) x 2 (Support Shot) = over 25k damage.
Human Smash also trumps maxed Snow Golem with G13 Masteries and Upgraded Earthquake Cylinder under these conditions. With enough dedication, it'll also break 100% Critical which makes it much better than Snow Golem since it will retain usefulness in Peaca and such.
Golem and Spear of God are just much, much easier to perform.
Assuming around 500 base damage again for range, since ego is slightly weaker but dex cap is higher...
x 10 (Crash Shot) x 2.5 (Critical) x 1.31 (Music) x 1.3 (Potion) x 1.5 (Campfire) = 32K damage, without elemental modifiers.
Also, r1 Support shot is x1.7 not x2.