Studio monitors by nature aren't designed to be warm. They're as flat as possible and engineers tend to compromise on slightly stronger treble than weaker, that way engineers don't overcompensate for their mix and end up with a recording that will just be unbearably shrill on anything - headphones or speakers as measured in a good room - that doesn't measure any worse on the treble vs the low end than, say, the old LCD-2. If you wanted a warmer studio monitor that will be used more for playback at home than mixing, there was no better choice than what you had - that's why for anybody not using them for actual mixing I always recommend the KRK Rokit series.
That said, studio monitors have relative gain controls so you can weaken the gain on the tweeters' amp vs the midwoofes'. Did you try tweaking that yet? The Alpha 50 has two - one for the high pass and another for the low pass. Decease the gain on the high pass and increase the gain on the low pass. My Focal 165VR midwoofers and Vifa BC25TG tweeters are configured similarly on my car's processor and amplifier - preamp from the processor has -4dB on the tweeter and their amp is set to the lowest gain setting, while the midwoofers have 0dB on the preamp and their amp's gain setting is roughly at 11:00 on the dial. (Note that doing the opposite on the KRK tends to reveal their tweeters having a treble peak)
Also, how are they mounted? Are the tweeters below your ears and not angled? If they are you're not hearing the tweeters' output in sync with the midwoofers'. Set them on angled pads to tilt them backwards to equalize the path length from your ears to the midwoofers and to the tweeters.
Ideal position. Note how equal the red and maroon lines are.
Most desks. Note how much longer the maroon line is to the midwoofer.
Compromise if you can't install them on the wall or shelf higher than the desk. Note how they're roughly equal now, though the red line to the tweeters might end up slightly longer but that also depends on the angle of the platform and the height of your desk.