I don't know if it's the formation/tactic I play but my Strikers are always immense.
NL/L2: Josh Umerah (cost £28k)
L1/CH: Kaylen Hinds (free)
L1: Dimitri Sea (two-years on loan)
L1/CH: Rodel Richards (£78k)
PR: Ahmed Kutucu (£5.75m in about season six, sold for £51m three years later)
PR: Joao Pedro
Otherwise, my defenders haven't done badly either up until the Championship.
NL/L2/L1/CH: Rhys Williams (free)
NL/L2/L1: Di'Shon Bernard (free)
L2/L1/CH: Joel Latibeudiere (free)
Otherwise, midfielders fade out a bit quicker. Though have liked Nathan Broadhead (free), Ian Carlo Poveda (free), George Dowling (loan, then free), Alex Pattison (free), amongst others...
Then a **** load of regens. My team is basically all regens now.