What kind of copper still are you using? That sounds about right for a pot still or a pot still with a column.
in order to increase the proof you can always do a few stripping runs-(a hot fast run in which you save everything- hot and quick which is a quick way to separter the alcohol from the water) Once you have 5 gallons of the low wines (everything collected from the stripping run) do a spirit run with the low wines. That will clean up the product and give you a much higher proof.
I am the guy who enjoys hearts between 110-120 and then I usually proofs them down to 90-100.