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[Andrakon]

Fluids don't fall as contiguous blocks.  When you drop a large mass of magma, some of the tiles fall before others.  There is a pseudorandom order to determining which tiles of liquid fall on which ticks.  This causes some of the blocks of obsidian to form before others, which can then cause the resulting obsidian layer to be uneven.

This ^

Anyway if you have a smaller area you are casting like a 20x20 square you may be able to get a solid pour on the bottom layer. My bottom layer was like 32x60 or so and it only had 2 holes in it, strangely in the same place every time, one exactly south of the other. The other layers were random though. I ended up fighting with it for a game year telling my dwarves to construct the wall over and over wile pumping the water out of the hole in the wall.

[Michaelsoftman]

I drained the ocean the other day by digging into the caverns, then digging straight up into the ocean floor from below.

Lost a miner, FPS went to 1 for a while, but then when it came back, the ocean was 2 whole z levels lower.

Bunch of dead drowned things in the caverns too.

[dizzyelk]

I've also seen a massive, massive sequential pump ring doing the moses effect to build on the bottom of the ocean.  That's far more dwarfly.

I've tried that, the FPS hit when the second level ring went online made me rage quit.

[GavJ]

Why not just build your own bay?

Dig a big natural looking hole next to the ocean, with bridges blocking it off + 1 layer of stone.  When bridges are done, dig out the stone so the water is right up against the bridges.

Build your glass stuff in your dry bay bed.  Then open the doors and flood it.  The end!