Ahh, that's a shame. My Dieter was evolved/99'd back on Loki, so it's stats are not on par with renewal. It's now loyal and 20% away from level 120, and I don't think I could bear to delete it and remake it.
These are the hard scenarios to deal with, is the stat growth deficit sufficient to do the releveling? I know sub 99 it is almost definitely yes, post 140.. I don't know.
From tests Homuns cap stats at 150, post renewal homuns ALL hit 150 across the board before level 150. pre-renewal homuns don't unless you were a vani.
And example is a level 62 evolved Lif
Pre-renewal stats were
Str 57
Agi 66
Vit 57
Int 89
Dex 81
Luk 72
Making a new Lif and getting to 62 and evolving it was
Str 70
Agi 88
Vit 89
Int 124
Dex 87
Luk 77
That post renewal Lif changed to Eira at lvl 100, stats at lvl 137 are
Str 150
Agi 150
Vit 150
Int 150
Dex 150
Luk 144
There certainly is randomness involved, but what I saw growth wise is post renewal my non-evolved lvl 62 lif had almost equal stats to pre-Renewal evolved 62 Lif. The evolution process added a large chunk on top of that. I think most would agree that Lif have the poorest non-Dex growth out of the Homunculus, which is why I used it for testing.