Hi!
I recently bought a pure white blade lvl 64 with crit 8. Wanted to safe some gold and try to +5 it myself. It worked like this:
+1, +2, +3, failure
then
+1, +2, +3, +4
So I was really lucky there. I didn't wanted to test that luck too much so I bought an astral and immortal. First try failure, stayed at +4. I thought, okay screw it. Some minutes later I thought, okay go for it.

So bought another astral and finally got the blade to +5.
So far so good. Now the thing is that when the blade became +5 the astral didn't go away. So now it's +5 with 1 astral left. And I just don't now if I should try to +6 it or even more if the astral would still stay.
I just don't want to put too much real money into a freakin game item, you know? So what would your suggestions be, stay at +5 or try to get higher?
Thx and bye.
//Edit: All in all, to get the blade so quick to +5 was some nice piece of luck, eh?
