Get rid of them, the only thing stock ibby pickups are good for is fridge magnets.
Generally, I agree with that, however, I don't dislike the overall tone of these IBZ pups. I planned on keeping them and replacing the INF3/4 set in my RG320, they are definitely worlds better, and not bad for a backup, but have since sold the RG320. I'm replacing them with a PAF Joe and Evo2, as soon as I have time to install them. The main problem with them is that they try to make them be a utility pickup, which is fine, but they're in between this and that and have no identity to them... If Ibanez chose to put a set of USA DiMarzio pickups in these guitars, they should have just went with the most widely used combo of standard DiMarzio's...
I'm not a huge fan of the Duncan JB, though I prefer Duncan in general, but I like that when you get a guitar with real Duncan pickups, there is some sort of market research done, ya know, there is thought put into it... Jackson/Charvel knows what their customers want, either Duncan or EMG, and they use the most common combos, if 80% of their Duncan prefered users tend to replace stock pickups with a 59/JB or Jazz/JB combo, why would they have Duncan create a JB/Invader hybrid pickup? Some scratched their heads when Charvel made So Cal's with an Evo neck and TZ bridge, I did as well, but at least they went with 2 of the most popular pickups, even though I absolutely hate the TZ, I understand why they chose it, just as I don't care for the JB but understand why they chose it... In fairness to the JB, I just found out that they are designed for 250k pots, I always put 500k ones, and got the sound I hated, I may need to give them another go.
I'm bored at work, so I'm rambling.