so when you say they don't sound "close" to you, I guess there are two primary ways you might hear that. One is if you are hearing early reflections. The other is related to microphone proximity effect, which is mostly EQ. If you want the "close" sound to sound more like the microphone is right on the instrument, then warm it up, bring in a bit more lows and highs. As you get more distance from a mic, then the lows and highs roll off. In my opinion, the VIPro samples were not recorded right on the mic, they were recorded in a way that already has given up some of the very close mic proximity effect that you might be hearing in other libraries. that is not really a bad thing becuase in real use that is probably what you want, not the close on the mic warmth.
You can use EQ or some other clever proximity related plugins that are out there to play around with that.
The early reflections are another thing...which are more related to the room. In the case of ViPro, the ER's are not there at all. You have to add them with MirPro or something else. So if you are complaining about the dry ViPro sasmples, then I don't think we're talking about ER, we're talking about proximity effect.
With Synchron, they have embedded a convolution engine into synchron player which is taking the dry samples...which are not neccessarily close on the mic again (see above), and then adding ER's. I agree they are a bit wet for my tastes, but you can adjust that in the way mentioned above, to a certain degree by controlling the wet/dry mix of the ER's.
In reality, we listen to an orchestra on a stage of some kind with ER's flying everywhere. If you want the closest dry sound you can get, then turn off the ER's first and then play with EQ to make it sound like its closer on the mic if that's what you really want, but in most cases I do not think that will sound like what most people would expect, but of course there is no reason we have to make music that most people would expect!