have you tried feeding him with a pair of prongs ?
my beardie started being a little aggressive and i tamed it with food i stopped letting it hunt for a while and hand fed every piece .. after a week or so she has tamed fine now .. no flaring , no aggression ..she is now 8 months and never bites anyone now my daughter who is 5 can now pickup and stroke her and she just sits there
may help . . .
3.2.0 - Bearded dragons -BLAZE,ROGUE,SMIRNOFF,MARLEY,JAFFA