If I remember I address this issue this weekend during a planned shoot ... in the cold ... BRrrrr
The first P10 I handled had a stiff release, and I commented on it on the Glock site, but my own CZ came with a better one, and I found it is lighter with a loaded magazine. The release has to rotate a cam I believe, and when loaded some of the pre-stress is less, is how I explain it, but I am not a gunsmith. The technique is easy, using the opposite hand to do it while keeping your shooting hand in the same, stable position, and it is faster and more natural. Unlike a Glock, which I own, it is two-handed in operation, and that can save your life, trust me on that from street experience. There are many attributes such as grip angle, feels like a 1911 in your hand, the paintability is super, and the accuracy is excellent, even at longer ranges, like 100 and 200 yards, which I shoot mine at for training. It is boringly reliable, all of which makes this fighting handgun an all-around carry pistol, I love it, and I have owned more guns over 40 years than I like to remember.
You have a great gun. Most civilians have never carried a gun when the chance of someone attacking you with deadly force was high, not unlikely as it is for most folks. When you on the streets with life and limb at risk you need a gun you have confidence in, not what others suggest, especially so of the Walter Mitty's out there, ask about with your local cops, pros on the streets, but remember some of the newbies are not as gun savvy as old-school cops, as PC staff members in most big police departments choose the guns purchased by folks who couldn't hit their foot with the barrel in their shoe!