I think the upgrade to the CA bridge is a sound one (no pun intended). I wouldn't be so concerned about the tailpiece. I, personally, don't like Gibson-style 2-piece designs, but I wouldn't change it unless you have a problem with it. There are lots of opinions on this, but I have changed the tailpiece on 2 different mandolins with no benefit in tone. I changed them only because I had problems with the old ones.
As far as the Epiphone is concerned, are you planning to get both the Epiphone and The Loar? I'm thinking once you get the Loar, you may not want to play the Epi. The Loar will probably be that much better.
2013 J Bovier A5 sunburst w/ToneGard
D'Addario FW-74 flatwound strings
Custom Wegen TF180 w/no bevel
1993 Oriente HO-20 hybrid double bass
Small body guitar converted to octave mandolin