QB96 spacing question

I have a 5×3 flowering area. As of right now I have a Blackdog phytomax2-200, a set(4) QB132s,and two QB96s going in there. I plan to remove the 132s and replace with two QB96s. I'm going to put the Blackdog in the center with four 96s in the corners. My question is how should I do my spacing, like how far off of each side should my 96s be? If possible I'd like to stay under 600w but that's not set in stone. My last round I ran around 550w,maybe a smidge more. I have a spare HLG-240-c2100a I plan to use for the two 96s in series. My only issue is that my Blackdog is a solid 210w,its not dimmable....I sure wish it was. I like my Blackdog for the UV and IR. I know they catch shit for being outdated but this thing will put out some light for sure. I was thinking maybe 10" off of each side for the 96s. I love the 132s but I grow plants of different sizes and the 96s allow me to adjust heights individually.....love that. If I ran each 96 at 120w plus the Blackdog thatd be 690w total, would that be too much for a 5×3? I know it's not so much about wattage with LEDs as it is PAR/Lux. Or should I just stick with the 132s? Any thoughts and ideas would be cool. Thanks