It seems like the last three or four k-girls I've seen have stretched the condom over me rather than rolled it on, resulting in a rather constrictive sensation. How would you approach asking her to roll it on or have me do it myself? The whole process seems to happen in a matter of seconds as the condom is usually already out of the wrapper when they take it out.

Which means you have maybe a second to stop her if you you don't like the condom applied that way. The first sign you are going to get is when she starts stretching the condom prior to applying it, Women don't do that when they plan on rolling it on, either by hand or with their mouth. That is about your only opportunity to stop her and tell her you don't like it done that way.  

is not recommended because it can lead to condom failures. You might mention that to them to see if they are more incline to roll it on.

Your dick provides a snug fit, and increases the sensation and "feel" for most guys because there is little air between the wrapper and your skin.  Her interest is in getting you to pop quickly, so this enables that prospect.  Leaving an inch or so rolled up at the open end also makes it like a rubber band, and can add some additional constriction to keep it filled with blood, often a helpful idea with older guys who tend to lose wood before they can finish.  

way of putting on a condom.  All my regulars use the roll-on method either with their mouth or fingers.  Maybe this is going to be a new trend like BBFS, which I am not a partaker of this method.

Also take BC pills or have had their tubes tied, so condom failure is not a big issue for them.  In fact, I have only had a few concede that pregnancy is  their  biggest worry if a condom should fail.   The Kgirls  with Caesarian section scars (who often hide them with belly tattoos and/or deep tanning) from child birth have often had their tubes tied at the same time.  Its usually very little extra charge to do it at the time of birth of her last child.  

I have had multiple girls do this, and I hate the snug feeling, my dick hates it and often deflates.

the girl is there is to blow your dick back up if it deflates.  Its like your tires, you just need to increase the pressure.  I thought you would know this.  If you're a magnum, and you don't weight very much, a sudden deflation can send you flying around the room as the air escapes.  Lol

For you, "Stretching it over your dick provides a snug fit, and increases the sensation and "feel" ..."

Valida, I have the same feeling as you. Like I say, I wince in pain and then girls switch me to magnums, which are too big for me. I prefer a magnum on my average ass dick over boa constrictor though. Lol.

This simplest solution to this that I have found is to simply BYOC. They’ll always fit just the way you like it. None of those too tight or too loose or too thick condoms again.  And, if you pull them out of the package and start to put them on she’ll either help you (giving you a chance to express a preference on how she can help) or she won’t.  IME they’ll always try to help, which I like. Either way you’re back in control of a key component of the great experience you’re looking for.

I tried it before, but meh still not a fan. And there have been some misunderstandings with condoms, believe it or not.  

Finishing too fast is the least of my worries and like you I HATE having my dick choked by anything but a nice tight vagina.

Another one where we agree!  

I’ve never had that problem when I bring my own. When they go to take it from me I just give them a very clear hand gesture showing how I want it done.  

to deflate, just as them to blow more air into the end.  They are usually accommodating.  lol