A:AnswerYes, it's too much and not necessary unless you're going to change subs later. The L7S 12 is rated at 750 rms. The Kicker 800.1 or Audio Control LC 1.800 should be perfect.
( The Audio Control has low level inputs if you're using the factory deck. That's a plus as you won't need a low level converter.)
A:AnswerDefinatly after buying mine from Best Buy I did another Instal with Best Buy products comp r12 single 12” in the loaded enclosure paired with the kenwood 1000w mono amp and my l7 on 600w rms outperformed it
A:AnswerI don't claim to be an expert but my level on my same amp & sub setup is that the amp is set to just about quarter of the way up & I have a bass knob as well. The knob I recommend you set at what works for you.