The general rule of thumb is that width steals from depth, so that as you expand the width of your vaginal it will reduce the depth.
Continued dilation with the wider stent may give you back some of that depth as you will stretch over time. But the advice already given is good. Jumping to a much wider stent can be uncomfortable.
Take your time, it will work out.
Also, just as an aside, unless you are dating Mr. Ed, most guys will be quite happy with you as you are and you would find intercourse quite comfortable.
-Sandy