Been using a BK2 for a couple of years now. IMO, the tip makes a huge difference. Taom was pretty good until it shattered, Samsara is a great break tip when installed correctly. White diamond is right up there with Samsara. I've been using the Outsville Hammerhead the past few months and I'm loving it so far. I've had a few BK3's pass through my hands... I just don't like them. They break great, better energy transfer than the BK2. But I just can't stand they way they feel. The break cue you currently have is one of the best I've tried, You should experiment with different tips before dropping hundreds of dollars on another cue.
If you're unsatisfied with the results you're getting with your break, look at your technique. At the end of the day, the cue only does what you tell it to. Buying the equipment alone isn't going to magically get you the results you're looking for, that only comes from putting in the hard work.