For Dragon Sage, full STR seemed like the best option for fast leveling until you can get Wide Forefoot Swing. Then you reset to full VIT and the only important skills are Evolve, Critical Immunity (to reduce critical damage), Health Funnel (to heal), FFS and WFFS (to do damage and wait 11 seconds for cooldown to finish to use again), and Death Flow / Combine Flow for stuns.
Good class for farming if you don't plan to spend much, but also pretty boring. Now that STR buffs from Guardian can't be used, STR / INT / Separation builds seem useless.