Have you addressed the detonation problem yet? Higher compression only makes that worse. How much cam are you running, stock cams with higher compression run cylinder pressures up to make detonation, common mistake. Generally higher compression is used with more cam timing. Cooling system performance and spark advance affect detonation..............
Forged pistons always hold ring lands better but enough detonation breaks all of them. Cast pistons are more brittle even sitting on a desk, forged will bend or smear aluminum slightly before they break. Forgings hold up better at high temp, they also can warp slightly out of shape and rebound back when stress stops, cast will simply crack there. We used to consider 6500 rpm the point at which high enough piston speed could break up cast pistons on bigger American V-8 engines. Even so, I strummed some engines over that and no fails, but the 6500 is a good point to go to forgings. If the cast piston is 'autothermic' with steel inserts up inside then they break faster.
Check wall clearances, forgings generally require more piston to wall than cast. Trying to set them close will tear up skirts unless the forgings are SPECIFICALLY molded for tight clearance (a few specialty ones are, most aren't, much has to do with the alloy used).
Have no idea where the forged for FI statement comes from, FI or not has ultimately nothing to do with piston choice.
If machine shop guy is hot he will know proper cylinder wall finish for the rings (ceramic, moly) used. You should discuss it.
Extrude honing is a joke, forget it. It cannot be tightly controlled no matter what they say. Material comes off where it comes off, you cannot change that. On say intake no two ports will flow or be the same afterwards.
I bump up the oil pressure spring in almost anything I take apart that is going to get hotdogged after going back together. Most classical type pumps maybe 1/8", you must then check that after shimming the bypass piston can still access the port opening that relieves the pressure. If spring were to coil bind then no pressure relief and pump blows up.
While water injection definitely works, I've seen it work too many times when it shouldn't have to tear up motors. The steam eventually pits the cylinder walls and then they start losing pieces. The rings chip out running over the pits too.
Don't make apologies for reading more than doing. I started out that way and while doing the doing I made very few mistakes as versus those starting with a clean slate. When both are put together it's awesome. Push that reading hard, it will further your physical work efforts by a factor of ten. The reading will allow you to weed out 90% of pitfalls that the ones who do not read must fall into to make progress.