["Next ability cast" buffs do not affect Titania's Razorwing damage]

Ability strength modifiers that only work on your "next ability cast" (e.g. Molt vigor, Pax bolt, Energy conversion) do not affect the weapon damage of titania's razorwing. However your razorwing blitz buffs will have the boosted strength, and you will get the efficiency from pax bolt so it's only the weapon damage and maybe drone dmg/hp calculation that's broken.

My guess as to why this is happening is because of the cast delay. The buffs get consumed on cast start but the exalted weapon damage gets calculated once the cast is finished. Mesa's peacemaker doesn't have this issue for example because the weapons come out as soon as you cast the ability, unlike titania where you spin around and do your magical girl transformation first.

How to fix? Not my job to tell you but I think you should put the exalted weapon damage calculation on cast start.

Here's an old and presumably dead bug report about the same thing. Happy new year, DE pls fix.

 

[Razorwing + Tainted mag doesn't work.]

Titania's razorwing's Dex Pixia magazine size is not increased by "Tainted mag" mod.

Other magazine size mods such as Magazine warp and Wildfire work, but not Tainted mag.

Also, the weapon with the mod gets it's magazine size reduced once I exit razorwing, like I never had the mod equipped. I can still reload it however, and that reloads the missing ammunition. (I.e. if I have a tonkor with a Rank 6 Tainted mag equipped, when I use razorwing and deactivate it, I see that my tonkor has 2 grenades in the clip, and reloading brings it back to 3 grenades -which costs me one ammo everytime I do this.)

 

P.S. I haven't tried this outside Simulacrum.