Easy As LITS: Lots of "S"s

Question

This is an Easy as LITS puzzle (LITS variation), where you shade cells to form tetrominoes
Rules taken from Grandmaster Puzzles:

Shade exactly four connected cells in each outlined region, to form an L, I, T, or S tetromino.
All shaded cells are connected with each other.
No 2×2 group of cells can be entirely shaded black.
When two tetrominoes in adjacent regions share an edge, they must not be of the same type (L, I, T, or S), regardless of rotations or reflections.
The letters outside the grid indicate the first tetromino encountered in the corresponding direction.

An example puzzle and its solution, taken from Grandmaster Puzzles (who in turn credit Chris Green):

Now, solve this puzzle:

Note: if you want to solve this on the image, clickthrough to get the full size version
First answer with a fully-explained logical solution path gets the checkmark.

Deusovi · Accepted Answer

First, a few regions can be assigned shapes:

Now, the break-in:

And now we can resolve most of the grid:

And with some connectivity arguments, the puzzle is solved:

Easy As LITS: Lots of "S"s

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