I figured that would be easier and quicker than uploading them. They are smaller on my own blog so it surprises me that they come out bigger.
Interestingly, the standard size for images in the image pop up is 640x480 px, which is probably the size they are visible now. Maybe the blog page shows them with my manual correction (to 320x240 px), while other pages just take the image in the size they have in the image pop up.
That could be it.
Just that I was lazy and rather copy pasted the manual sizes than go through the trouble in the pop up (because my computer wasn't cooperating with the pop up)