That comes as no surprise.
Two FR10s = $1200.00. Two archangel preamps = $260.00. You've got $1460.00 in your two-FR10 rig. If you've gotta have two - and you've had to spend extra money and time modding them - you could instead have bought a powered monitor with enough SPL output to keep up with a band and have real money left over. You can get a killer monitor for less than $1460.00.