I think the OPs is saying our present 109F is a combination of times/airframes. I will consult the 109 parchments when I get home, and ack-ack, I do consider myself a 109 Experten, lol. I am not, however, a Spit hater.
On all other post point, yes the 109 F4 is fine the way it is. It does not have the top end to go head to head with LW planes, so in it's present modelling I find it adequate.