It is an issue that you guys have an unfair advantage over him and the rest of the table. But currently there is no solution.
What you did by being transparent and offer chop was as fair as you be (even though it is still unfair, but there is no solution to this issue yet.)
Exact same issue discussed here:
https://www.google.com/url?sa=t&sour...HnflG_wFIYR_Y-