For your first point, the g43 isn't as big an upgrade for grens as ppsh are for conscripts.
In regards to your second point it's true that tactical support gets an m5 but it does not come with elite assault troops like the Soviet one packaged into the deal. The ostheer callins are much better to compare to because ostheer tech pace is closer to soviets then usf is.
Don't g43 grens beat ppsh conscripts?
3CP is around the time when you can get a normal halftrack out anyway, isn't it? and the assault guards aren't an elite unit...