This ^^^^^
Does that trw piston have an offset pin? It's been decades since I looked at one but i don't think it is offset. I would put them with the dish facing the chamber and call it done.

I don't know what the compression might be without knowing the deck ht. and the volumes of the dish, chamber and head gasket.

The valve relief depth show the valve stems inclined toward the exhaust side: wrong.

The dish was machined in those pistons after they were bought. When new, those pistons are flattops w/ 4 valve reliefs allowing them to be installed on either bank. You can see the remnants of the other two reliefs on the dished side.

If all 8 pistons had the dish cut the same way, then 4 of them will appear to be installed incorrectly if the directional arrow is pointing to the front.
The other bank may have the dish in the correct orientation.

One thing to remember is the piston is running away from the intake valve on the intake stroke, and then during the compression stroke some turbulence is good to keep the air fuel mixture mixed up. The reasons for quench pads on pistons and a quench area on closed chambered heads. I guess it must work as I don't know of and aftermarket wedge heads without a quench area in the chamber.

I always soften sharp edges. Smoother is better. Eliminate potential hot spots. Verify the extended tip plug isn't crowded.

If the cam, and especially the overlap window area, is smaller than optimum, radiusing & blending those sharp edges is helpful as it makes flow through the chamber more efficient.
If the cam is too big: leave it along.
Large chamber + low static CR: don't bother.

Ethanol in the fuel makes the fuel act like it has higher octane than it really does, compression can go higher with ethanol, the only concern could be fuel system corrosion but in nearly 20 years I have never had an issue running old fuel system components even my experiment with a bunch of parts and pieces in a sealed up peanut butter jar has not shown any degradation of the parts. It needs access to the atmosphere for extended periods of time to absorb moisture and that is what causes corrosion.

As for messaging the pistons I always round off all the sharp edges, you never know when you might get a bad batch of fuel or maybe they are out of premium and you got to run low grade in a pinch or the fuel delivery guy acidently put some diesel fuel in the tank in the ground, maybe you decide later on down the road to put some smaller chamber heads on and the work is already done without disassembling the short block or... it is just cheap/free insurance.