An important key to remember with the shirt, is that it doesn't want to help you - it wants to shove the bar out of the way so it can easily bounce back to an unstretched position. It is up to YOU to force the bar along the path of greatest resistance, which will equate to the path of greatest assistance.
Now when you explain that you are losing the bar over your face, this often suggest to me one thing - as you lower the bar and touch, you may or may not be dropping the bar too far down your chest (need video but I am betting you aren't). Then as you press, you are probably attempting to press back in a path commonly referred to as a "J' stroke. This is indeed a reasonable estimation of the bar path, but the thing to remember, is that as that bar comes backwards from the sternum towards the clavicle, the shirt is very content to have your forearms angle backwards behind the elbows, so that the shirt gets deloaded and then you drop the bar on your face because you are essentially trying to do a tricep extension with a heavy weight. Thus, as you press backwards, you need to focus on throwing the elbows backwards in C shape patterns to keep them under the bar! This elongates the lever arm from the tips of the sleeves of the shirt to increase support and of course as you finish, you need the bar to be back over the shoulders so that it is at a resting position.
Regarding not being able to get tight... An endless struggle. Perhaps the chest plate is too tight (I doubt it... you probably are just inexperienced in the shirt). As such, I suggest practicing good scapular retraction with things like pendlay rows and just setting up with the feet up on the bench to give you a little more leverage to get onto the traps and retract the hsoulder blades.
Now I realise none of this is particularily specific to a RageX, but to be honest, the function of most single ply shirts is fairly similar. I have worn F6, fury, katana, superK, superK extreme, AND RageX, and though I can't say I loved the RageX, it didn't seem wildly different from any other shirt (perhaps except the SuperK extreme by virtue of the super low collar that is like 8 ply...).
Feel free to post video. Happy benching.