Do it, TE is very deep this year although you will downgrade to an extent.
F. Jackson in my opinion is one of the most underrated fantasy players in the league (I have him in all three of my leagues). He's averaging over 4 yards per carry, is getting undisputed number 1 RB touches, and the kicker is BUF is emerging as a somewhat dynamic offense giving him goal line opportunities.
Starks is a nice bench piece (an upgrade from Stewart) and could have some upside / a potential flex fill-in during bye weeks.
I'd make the trade. Are there any good TE's on the waiver wire??