Oh yeah, everything I commented was for PvM, I did not intend on WoE at all (which in this case you could go for 100 MDEF, VERY useful)
And I agree, in high TI you are able to tank most things but certain monsters like Banshee, Dolo, that little green guy from Mora, are extremely hard to freeze even if you're 150. Kasa/Salamander is generally easier to tank due to just wear the proper resist - but if your team doesn't follow you and you have a few berserk'd Salamanders on you, you won't be able to out-pot it (so yea it really depends if you have a good team or not!)
Another guy I hate is Incarnation of Morroc Golem. It often EQ and MB at the same time. With full reducs - DR, medium shield, etc, its EQ+MB will still hit you for ~10k+ with teammates on the screen, so if two Golems go off at the same time, you'd have a hard time reacting and out-pot it (happens!) Otherwise, a single one poses no threat.
Anyways, since reducs are more important than max HP then potting should be crucial. If you can't afford ranked slims, you can just go for fat whites (ya seriously, with your pushcart you can carry about 600, enough for 1 TI)
About your shields:
Novice Shield is basically for free so card racial/size reduction! - it reduces all sources of damage from the monster. Cards are incredibly cheap too. Formless, Demon, Insects, are usually most common in high TI, small/mid/large size reduction is useful if they don't have the same race; rarely will they have different size + different races (that pose a threat) enough for you to enough hodremlin.
Lastly, don't use tatacho. In order for Tatacho to take in effect, it must have the following conditions 1) The monster must be neutral property 2) It must use a neutral property attack
So yeah...don't bother with it