Three Flamed Insane Dungeon 4-10

I have been pressing through the insane dungeons for a while now.  Brief hangups on a few of them, but eventually I'd get lucky and get through.  I am free to play, so, that means I do not have Mino or Spirit Mage to work with.  Instead my team is PD, Cupid, Druid, TG, Santa, and either Griz or Dread Drake.  Generally you want Griz if the problem is enemy heroes, or DD if the problem is buildings.

I got to insane dungeon 4-10 yesterday.  My goal is to three-star it.  Doing that increases pretty impressively the shards and experience I get for farming dungeons.  I looked for some help on youtube, and found it with this video.  It's better than most videos for ID 4-10 in that he explains how it will work, and thus what you're trying to do with the drop.  In this case, to get all the heroes to go left together.  It took me a few tries, but finally I dropped my heroes and copters on the opposite sides of my spells, and that got it done.  The heroes all went left, and very soon...

Winning...

 Oh yeah!

Three flames!  Sweeps from now on!

There's often a snowball effect when winning in CC.  I did not lose a single hero, and only 10 copters.

I have been farming ID 2-10 since I completed it recently, which gets 0 or 75 shards (+2 for pets) and 53,330 experience (+10% for pets).  But now I farm as follows:

Cha-ching

0 or 88 shards (+2 for pets) and 124971 experience (+10% for pets).  More than double the experience!  Wow!  Now, the chance to get nonzero shards from a blue dungeon is said to be about 30%.  So, my expected shards have gone from 24.5 to 28.4 -- a 16% increase.  Also nice.

The question now is... what do I do next?  I can return to dungeon 2-1, trying for a 3-star to get the artifact Goblet of Life.  Or I can start trying to push HBM, where I have completed S but not T.