Something to note is that when Antipode says "scales with your Rune Bolt tree" a side implication is "does not scale with your Runic Invocation tree". In particular it means that the various +RI crit nodes in both RI and Runebolt are no use for trying to get crit more easily, unless you only use nova (which isn't that bad tbh). (Otherwise Antipode does get enough attacks to mostly make up for the 2x more multipliers in the RI tree and the 6x base damage of nova)