Greets!
You actually tuned it to ~41 Hz according to the displacement plot, which is also shown as a lower 1st impedance peak than the 2nd one since they would be equal amplitude if tuned to Fs and the 1st one would be higher if tuned above Fs, so it's not high enough if you want a ~55 Hz tuning.
Note that I made some detail changes to make it a bit more accurate [V2_GM], one of which was based on a material thickness of 2.6 cm [~1"] for the bottom plate [L34], but for some reason is only 0.1 cm [~1/32"] and of course doing the driver/vent summing at the listening position.
Worse, even getting rid of the vent, bottom plate and just have it be a tapered TL only raises tuning to ~Fs, so either accept the current alignment or make it a simple TL [V3_GM_TL] for a ~Fs tuning or start over from scratch and design one for 55 Hz.
GM
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