GK 65 to 75

Hi everyone,

So I have the GK65 for a while now, I can take it under 5 minutes and keep it all day long. I yearned for something bigger so I bought the 75. I stretched for a long time and used plenty of lube, but it was still a struggle to put it in. It didn't hurt tho. I couldn't keep it for very long and when I took it out, there was some blood (not a lot of it, and it was kind of pinkish). So I kept clear of any plugging for a week or so, still no pain, and no blood after that. Today I played with my GK65, my usual plug, and I still didn't feel pain but again it came out with a little blood. So my questions are: how long do I have to wait before resuming plugging? And also, is going from the 65 to 75 is too much of a jump, which plug do you recommend to bridge the gap?

Please forgive my English, as it is not my first language.