Wingspan

How important is the Wingspan ratio? I am currently around 175 but my Wingspan is only 176 if I add now 7-8cm my wingspan will be 6-7cm more do oyu think that is a problem or might look strange?

You'll be fine. People over analyze proportions on this forum tbh. No one else will really notice anything. Your arms will be a little short (relative to your height), but nothing crazy.

You have two arms. Your final height (183cm) will be 7cm more than your wingspan (176cm). This basically just means your each of your hands will each be 3.5 cm higher than they would normally be. If you only do 7cm, then it means each hand will be 3 cm (so basically just an inch) higher than they might normally be.

Arm to body ratio (ABR) and leg to body ratio (LBR) are more important than wingspan. My personal preference for minimum ABR is 0.425 and maximum LBR is 0.525. Here is how to do the measurement: https://www.researchgate.net/publication/354894811_The_Human_Body_Proportions_in_the_Preoperative_planning_of_Stature_Increase_Surgery
you can also find average men body ratio in there.