No focus or summoner's boon: max hit 10,280
Lvl: 84
AC: 8,755
HP: 65,147
Dark Minion focus no summoner's boon: max hit 13,216
Lvl: 86
AC: 13,685
HP: 101,832
Dark Minion focus WITH summoner's boon: max hit 13,976
Lvl: 87
AC: 14,960
HP: 111,320
Immortal Minion focus no summoner's boon: max hit 13,824
Lvl: 86
AC: 14,705
HP: 109,422
Immortal Minion focus WITH summoner's boon: max hit 14,582
Lvl: 87
AC: 15,980
HP: 118,910
In each case, I summoned with and without the VT items equipped and it made no difference at all.