I started the dive at about 3,000 feet to strafe a strip of artillery bunkers, going down at around 250, 25% throttle or less, and speed was climbing to about 280-300 (MPH) or near to that range. I don't directly dive, it's more of a 45 degree angle and about 500 feet down from the first bunker, so I have more time to set up for the next bunkers. After I punch the first one I'm at about 1,800 feet, still within 280 by twenty over or under, and able to get the second one. For the last one though, that's where the problem comes in. I'm doing only about a 10-25 degree pitch down, and that kills speed with no throttle, and it drops near to 180 (at least below 200). Now I'm anywhere below 500 feet, most of the time 300 feet. Then after hitting the third bunk I pull up, still at 180 or so, and nothing happens. It's essentially stalling, but I don't pull back hard enough to induce that to happen.
The only reason I think it stalls is that it's not a very agile aircraft, and then the wings feel light and the weight goes to the tail, and that's when I drop. I'm always checking my instruments (no different than I do when I'm flying a real plane) at least every three seconds before dive, and then after I strafe a bunker I check again, probably once every second when I use the 12.7 mm with the ground selected rounds.
It happens every single time I go sub 500 feet. With the P36, it never happens. Hell, I even fly with the wings vertical through the trees to clear my tail off, but the P40 won't ever be able to do that..