After spending time with Tactician myself, I am 100% OK with the difficulty. I have yet to find a battle I can't win.

The buffs to Summoner help tremendously. Summoner is extremely good. I am also using 3 glass cannon characters + 1 tank, which while difficult gives me the damage output / CC potential to deal with the higher healthpools.

In all honesty though, it seems to me the 50% boost is overstated because it seems Classic Mode numbers are nerfed compared to EA.