Does not work with glock speed loader. - Elite Tactical Systems Glock 43 9mm 9-Round Pistol Magazine

I wanted a larger capacity magazine and I got that, along with quick and courteous service. The main issue I have is that magazine does not accept the Glock-supplied "speed loader" at all. It takes significantly more time and effort to load a full 8 rounds into the unit than with the loader. The last round is a huge struggle, producing damaged finger nails, but I eventually can get it to full capacity. I tried three different brands and types of rounds...all experiencing the same issue. I have no similar trouble with the lower capacity OEM magazines. I now have 6 high-cap magazines, fully loaded; so, hopefully, the reloading during a heated situation is not a problem. For target practice, I simply stick with the factory magazines.