First of all, I want to commend you for considering a menstrual cup as well as doing some research about them before buying something.
Second, thank you for including some helpful information so that I might be able to narrow some cups down for you.
Being that you have a medium/high cervix, and are worried about inserting a larger/wider cup, you may prefer something longer but more narrow.
Not all ‘small’ cups are shorter than their larger counterparts.
Here are some cups that of brands that offer the sizes in the same length but a narrower diameter:f
Diva Cup Model 0 & 1 –
Diva Cup Model 0 is their narrowest cup and has been dubbed the “teen” size.
Diva Cup Model 1 is their middle size which is slightly wider but not as wide as most large-sized cups.
Casco Cup Size 1 –
The Casco Cup is available in three sizes: Mini, 1, and 2.
The Mini is shorter than sizes 1 & 2, while sizes 1 & 2 are the same length.
Size 1 is a tad longer than the Diva Cups with the stems intact but is a bit softer.
I often suggest the Casco Cup when someone experiences extra bladder pressure or cramping with the Diva Cups.
Monthly Cup Size “Normal” –
This cup is also offered in three sizes: Mini, Normal, and Plus.
The Mini is shorter than Normal and Plus, while sizes Normal and Plus are the same lengths.
These cups have a firm secondary and upper rim but with a soft body. Because of the firm rims, these cups are normally easy to open but depends on if the person has a sensitive bladder/urethra or bowel.
Some other cups that might interest you:
EverCup “Standard” size –
The EverCup is available in three sizes: Mini, Mid, and Standard.
These cups look very similar to the Casco Cups but their sizing is different and they are not the same length. For this brand, I would suggest the “Standard” size. It’s the same sizing as the size 1 Casco Cup.
The firmness seems to be in the middle of the Casco and the Diva Cup.
Small-sized cups with longer stems:
Mermaid Cup small
Venus Cup small
Yuuki Cup small
While these cups have shorter bodies, they still have a decent length stem for those with a medium/high cervix.
I hope this helps and gives you someplace to start. If you have any additional questions or concerns about one or all of these cups, I’d be happy to answer them if I can.
Until then, good luck! <3