Altium - line spacing between the parameters in the schematic symbol
To fix this and have the change propagate to all instances of that part, you'll have to fix it at the schematic symbol level.

Go to the schematic library that contains the symbol (here, for your resistor).  Tools -> Component Properties.  Here is where you can add the parameters and which are visible.

Then on the symbol in the Schematic Library Editor, you can drag them around and position them how you like, centered or whatnot.  You can have a different footprint that you use that adds the additional parameters.  

Then save.  This will now fix it for all future parts that you instantiate.  To backfix all the parts already in your schematic, go to your schematic and click Tools -> Update from Libraries.  You can fix all hierarchies at once, just one hierarchy, all parts, just a few, etc.  You can control all those settings from that dialogue.