The angles right now are not great but they're not terrible either but I wouldn't push it any further. The problem isn't using spacers per say but more that if the differential is not dropped proportionally with the hubs then you're essentially putting your CV joints in a bind. There is more to most lift kits than just this one point but it is the most looked over. If you did not have the drop bracket installed on the diff your angles would be much worse, probably already would have noticed damaged parts, if you want three more inches you're going to need to have more of a diff drop (I would suggest a 5-6" diff drop to give you flatter angles).
Honestly I have never lifted a 1/2 ton so I am not an expert on the different brands but research them, find what is in your price range and look at the reviews, if you're seeing bad reviews you may need to adjust your price range. A little savings now can end up costing you more in the end with parts replacements.
---------- Post added at 04:26 PM ---------- Previous post was at 04:24 PM ----------
As an example if you keep just trying to lift without a proper diff drop then you will look like this...