Going hard with only 1.25 cu ft

I've had a million subs but I'm on a mission. I wanna hit 142s with a single 10 in 1.25 cu ft net tuned to 35hz. I did it with a Skar svr but they sound horrible. I want it to sound good on music. I just bought and tried a Fi XV4 10 but I just don't have the power. And that's the other problem only around 1300 watts. I've been looking at the Sundown U10 but I don't think it'll make a difference from the SA without adding power. Any suggestions I'll listen.