1) Dragonsworn hauberks are not restricted in any way. You can still do five point OC on them and they will always be usable in Molvik.

2) The above also applies to the DS hats with +2% magic damage.

3) Any piece with +40 hits or hits cap is limited to 35.0 imbue points.

3) Any Legendary weapon is limited to 32.5 imbue points.

4) Any other piece is limited to 34.5 imbue points.

All of the above limits apply at level 39. At lower levels, the specified limits must be lowered by one imbue point per level below 39. So don't go into Molvik with this sort of gear before level 39.

Thidranki:

1) DS hauberks are limited to 23 imbue points.

2) Ditto DS hats with +2% magic damage.

3) +40 hits/cap pieces are limited to 15.5 imbue points.

4) Legendaries are limited to 11 imbue points.

5) Any other piece is limited to 14.5 imbue points.

Again, all limits are for max level (24). Lower levels lower those limits as for Molvik.

Notes:

For Thid, the assumption is fairly balanced spellcrafting. The limits above don't necessarily apply if you're in the habit of putting one very large (generally, greater than 10 imbue points, or 13 imbue points for a Legendary) gem and several small gems into the piece. In that case, add five to the limits specified above.

For non-DS/enhanced/Legendary level 51 gear, there are no limits beyond the usual 5.5 point OC limit for Molvik. For thid, those pieces are limited to 24.5 imbue points.

For level 31 gear in thid, you are limited to 4.5 points of overcharge.
Level 30 and lower gear has no new limits.
Since you can easily cap everything with less than 4 points OC on level 31 gear, this should have no real impact on level 31 templates other than to require that you SC all pieces more or less evenly, rather than heavily SC some pieces, and have some pieces with little or no SC.

Looking a little deeper under the hood, all inherent bonuses on DS/enhanced/legendary gear are treated as if they were a fifth gem. Each % bonus is worth 2 imbue points, each point of cap is worth 2 imbue points, 40 hits/cap are worth 9 imbue points.
Since these are treated as a fifth gem, their imbue values are, of course, halved if they aren't the largest gem in the SC. This will typically be true in Molvik temps, and seldom be true in Thid templates, hence the values mentioned above.
The "Bonus Level" is the imbue value of the piece after SC'ing, with the "fifth slot" included if applicable.