I've never had to buy new CV shafts, I have a Ground Force kit
But "IF" I ran a 2.5" drop spindle and broke the stock inner CV clean off
...I Certainly wouldn't replace it with the same thing
How much did you say the upgrades cost you? certainly not $130
I'm not sure the OP is looking for that much of a drop, and the added cost involved.
But I could be wrong