reccomendation on wiring/new subs

Hello, I have purchased a Audiobahn A18000X and (2) Audiobahn AUDIOBAHN AW1251M 12" subs. Amp Specs: A18000X Power Handling: 1 x 1000 Watts @ 2 Ohms 1 x 500 Watts @ 4 Ohms Peak: 2200 Watts 2 Channel Amplifier PWM MOSFET Power Supply Variable Hi/Low Pass Crossover Bass Boost Subsonic Filter 3-Way Protection Cobalt Blue Illumination Nickel Plated Connections RCA Throughput Connections 11 1/8î W x 2 1/8î H x 11 7/8î D 1 Year Manufacturer Warranty Sub Specs: Peak Power Handling: 880 Watts RMS Power Range : 400 Watts Multi-Connect Lug Lock Terminals Non-Pressed, Non-transfer paper cone KM3 Coated for virtually no cone distortion Flame Stamped Strontium Magnet w/ Faraday Cage Dual 4 Ohm Voice Coil Frequency response: 24-1000 Hz Sensitivity: 92.1 dB Magnet Weight: 45 oz. Mounting Depth: 5-1/4" I have them wired in: Option 2 (series/parallel) = 4 ohm load Voice coils wired in series, speakers wired in parallel Recommended Amplifier: Stable at 4, 2, or 1 ohm mono Im wondering what would be the best wiring method to amp for most power and deeper bass. Right now it sounds like its bottoming out when i turn it up. And lower volumes, the bass sounds nice but the deeper stuff I cant hear to well. Also, if this helps they are in a large slotted box together. Any help would be greatly appreciated. Thanks.

If I was to run it this way, would I get the most power? Found this image on the net