TxAg, the 2114 has a fatter diameter with a thinner wall, the 2018 has a smaller diameter with a thicker wall.
If I was you, I'd add a 100 grains to the front and call it a day.( if you can get it to tune)
You can do it by brass insert, or steel broadhead adapter, or just a heaver broadhead.
The magic # for EFOC is 19% and higher.
Lets take two arrows the exact same weight, let's say 609 grains (because I have one), yet one arrow has a 300 grain broadhead (assuming we could get it to tune)the EFOC on this arrow would be around 24.58% ya!-babe!
Now the other arrow, the same weight, yet has a 125 grain broadhead, the EFOC would be around 11.86 not vary good for penetrating.
So, to keep it simple, the lightest arrow I can find with a stiff enough spine to handle the broadhead weight, you want most of the weight up front.
This becomes even more important with light tackle, and 53lb with a 425 grain arrow is light, 8.02 per lb.
Hope this helps ya.