Sub/Amp combo question

[saxguy9345 10+ year member]

Audiobahn A2002T

JL Audio 12w1v2-4(ohm)

My box is about 2.1ft^3 (with driver/port), tuned to around 36-38hz

How well is that Audiobahn powering the JL? I have constantly felt the gain @ about 60% turn is perfect, BUT I know that manufacturer specs call for about a .4ft^3 smaller ported box AND tuned to 28hz. I feel like since it's such a low powered sub (300 rms 500 peak) that the box size matters two fold and I am not getting what I want from it. The amp is rated 200rms @ 4ohm bridged too, but I really don't have the knowledge to tweak per spec, just my ears. Long story short, I built that box as a complete noob and it was sealed on day 1. "1000w subs friend" said "I fart louder than that sub, lets port it" and got as close to spec as we could, but it was too shallow to take more than a 12" internal port. I think it's realistically around 36-38hz, plenty loud for what I want (for now).

Thoughts? I actually just re-caulked / padded the interior of it and almost plugged the port, but it's pretty much the perfect type of "loud" that I like and I didn't want to mess with it, but I would really like more range (sq) from it.

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[saxguy9345 10+ year member]

I just read about setting the HU gain to +15 before setting gain on the amp. My x789 has 5v preouts, think that would help? I only saw that alpine's don't put out their max volt until HU is max gain. Kenwood the same?