-When installing RP 2.3.3 it asks which ammo fix to install: Glovz or YAAM. Default setting is YAAM.
And I'm pretty sure the current RPU patch is build on the YAAM version (i.e. the changes RP makes based on selection (proto/items and proto.msg etc.) although the errors this causes may be minimal (proto.msg, line 511 only).
However, this choice needs to be emulated in ddraw too. RP will set it to YAAM (damageformular = 5) by default (i.e. if not selecting Glovz), but the RPU patch resets ddraw to 0, which will result in a bit of a mess (i.e. it uses all the DT modifiers as if they are DR modifiers).
I did some testing (shooting Vic with a 14mm).
And I'm pretty sure that when setting ddraw to 0, the 14mm pistol uses the proto file for 14mm ammo and that is 1/1 dmg and -8% DR. Which is an average of 10 versus Metal Armour.
However, it should be 1/1 dmg and -8 DT. Which is an average of 17 versus Metal Armour.
So setting ddraw to 0 appears to fail to use the YAAM formula, but uses the proto files that are corrected for YAAM.
Either way you need to adjust ddraw, after patching RP 2.3.3 with RPU_v2 to the ammo mod selected during 2.3.3's installation.
UPU, on the other hand should probably be set to 0 (but I haven't tested Killap's unofficial patch).