Ear stretching

So when I started I thought I did enough research to be fine but now I'm not sure. I've gotten to a 8g without any pain. I tried to go up to a 6g but the size is really big. I don't wanna force it and it's just not going. I'm waiting 6 weeks and they feel healed so that's not the issue. I'm thinking that the Etsy shop I bought them from didn't size them right or something. Does the sizing look correct for it being the next size up? I just don't know how my ears will go from one size to the next without harming them. The top is the 8g and the bottom is 6g.