Yes and no.
Yes, if the cap is looser based on the baseline (starting erected) glans measurement you've provided, and decide to go a bit crazy on the vac pressure (8 to 10 inHg). As your glans expands to nearly double the size, the cap restricts the skin form pealing off and create blisters.
No, if you're not taking the chance in going into the high vac pressure zone and stay around 5 to 8 inHg. 7 to 8 inHg is considered as moderate pressure, which forces your glans to expand into the 1.75x it's size already.
Be mindful that not everyone's glans can expand quickly without blistering or suffer micro fissures, even at 5 inHg. The cap is just for preventative measures.
The cap can be taken off and put on with ease after a bit for practice. I used to use it with my Doc Johnson pump, but I stopped after I practiced safety pressure expansion in mind.
Go light first until your glans can be observed to go higher each time. Start with 5inHg, then 6 inHg, and back to 5 inHg. Make sure to add more blood using stimulation for highest erection you can.This is the safe zone. Once you know it's good for the week, go to 6 inHg, then 7in Hg, then 5inHg. Same erection method. Kegel is a great too for this. If another week gone by without issues, enter into the moderate zone. 7inHg to start, 8inHg to further expand, down to 6inHg to keep expanding. 90 minutes of cock ring at 70% constriction with constant cycling of blood into the penis.