Is different, iirc is VIF unpack issue there. We have that issue also on PS3. This issue is closer to Baldurs Gate, or other Snowblind engine games than to Steambot
You mean Downhill Domination, that is also totally different issue. Also closer to VIF1 than VU.
Yeah, this need per game VU patch then, like Castlevania. Btw. You can compare issue of Steambot with PCSX2, just set VU clamping to None there, and it will be the same as on PS4. But like i said earlier ps2emu on ps4 sucks on VU. There is nothing that can be done remotely.
Not at all.

Like i said above.