Power difference with warm and cold engine – 80s ABK

So I drive my Audi 80 ABK slightly warm and then I step into something, but I can not fully. Well, if the engine has so 70° according to temperature indicator and the oil so about 60° and I give then half gas so not full gas then my motor pulls better than if it is at temperature (90° cool water – about 80° oil). Normally my motor should pull better if it is warm or not? Especially in warm weather falls on that just nothing more goes on…if I compared to 5° outside temperature give half gas is the motor fast to 50 kmh, but I drive at 15° outside temperature the motor completely sucks off…I need a lot longer to get to 50 kmh…the motor just pulls out below worse! For info, I measured the pressure of the individual cylinders in the cold condition and there it was on the 1st cylinder 7.5bar 2. zyl 8bar 3. zyl 7.5bar and 4.zyl 8bar….the details are of course not 100% accurate…measurement I made with a device…no idea which n name it carries In the warm condition the engine should produce even more bar per cylinder…so therefore also better performance than in the cold condition, but according to the comparison (5° and 15°) not really true!! Can anyone help me?