Why don't you do the skaters jumps that LBSS is doing? Or slalom jumps going forward? Or jumps over a knee-high rope while also going forward? Bounds. Sprints. Short distance sprints. Long distance sprints. Suicides (very basketball specific). And so on.
Well, speed is a manifestation of quickness combined with strength. Where strength is non needed, you have "quickness" (for example, how many spacebar key strokes can you get in 10 seconds? The best I got was 110, I think). That's quickness. Speed is a manifestation of quickness + strength, or quickness + the force to overcome your own bodyweight to express that quickness. That's it.
Now, the movements in which you express that "speed" better or worse depend on the muscle strength that these movements depend upon, your natural quickness (CNS quickness), the muscle strength ratios and your movement efficiency in that particular movement (how often did you practice it with proper form).
So if you feel like you need speed... well... why don't you do sprints while also continuing to improve the posterior chain in the gym? Other than that, all these low level plyos that I suggested are reactive in nature, but submax, so the strength part plays less importance but the "quickness" part (CNS) plays more importance (trying to emphasize low ground contact times, even if you don't get up or forward maximally).
Combine training like this with the strength you get from the weight room and you get speed.
If you're feeling important differences just doing silly, poor form plyo work etc, imagine what the difference would be if you were to incorporate actual good plyo work (multi-directional jumps, bounds, donkey ankle bounces, sprints).
Heck, if I were you, with a good strength base but looking slow, I would do one of the VJB novice or beginner plyo program. Whenever I did those they felt so good, and I'm more reactive than you/quicker/faster (don't take this the wrong way, I'm not trying to be arrogant here or anything).
The point is that you'd have a lot to gain from doing novice/beginner plyo work for a while, IMO. In fact, you might be amazed at the results, in your particular situation. Heck, even Air Alert could work for you.
That should be a premium when you broad jump. I think I personally am pretty (somewhat) good at them when I broad jump (check out my knee pull to chest after the take off):
Also, check out how much I stretch out during the take off. I'm not saying I have perfect form (Toddday can chime in and critique it, since I don't have a long broad jump anyway) - but I imagine if you could replicate that more, you would get further. In your case it seems like you're using 50% of what you got (assuming you want a ME broad jump). If not, if you were doing them submaximally, then fine, but at least stick the landings, don't collapse when you land - you'll get a great training effect from that alone - knowing how to take in that eccentric force of the landing (kinda like in a forwards depth drop).
In contrast, strengthening the hip flexors can be advantageous for people in posterior tilt as strengthening them will put your pelvis at a position that is more advantageous to engage your glutes. See if you have sufficient strength in your hip flexors. Place one foot up on a box so that your thigh is up above parallel. Then raise the foot up and hold it for 20 seconds without bending your support leg or squirming around.
If this test is at all difficult you could probably benefit from stronger hip flexors. To strengthen them, simply incorporate that test for a couple of sets 3 days per week. Another exercise I've found very helpful for posterior tilt is something I call a "hip suck". Lie down on your back with your legs straight and touch the area where your upper thigh inserts into the hip. Next, without bending your knee, attempt to draw the hip into the socket of the hip joint. You should feel a deep feeling in the groin. Try to relax your thigh while doing this. Hold the position for 10 secs. Repeat for 10 contractions. You can also do this standing up just make sure you don't compensate by bending your plant leg and leaning sideways.
Do RDLs, where only the hips are moving back and forth (the movement of the hips lowers and raises the bar). That way you know you're doing them right. If you can raise or lower the bar without the hips going front or back, then you're pulling with your back, so you know you're doing a wrong movement. If the bar moves, the hips must move.