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While more port area wont limit the upper frequencies the box being tuned at 32hz and with said frankenwoofer it may not play those frequencies that are 20+ hz above tuning the same as the old woofer especially with the changes made. From the Zv3 to the X series there is a 11hz drop in FS, granted since it is a frankenwoofer it could be a bit different than that still since the motor will have a huge roll on the T/S parameters so its not like you can just insert numbers from the 2 models thought it will give you a slight idea. Increasing port area even more will not get you to hit those high notes like it once did, and if you went to model both the X series and the Zv3 series in the same exact box you would have 2 completely different results which would back up what is being described. I would experiment with current box as much as possible with trying different things like raising tuning if you want more highs and shrinking port area just a little in an attempt to flatten out the range. Also iirc the box specs on Sundowns site haven't been changed forever and I remember someone there saying they needed to be updated and I thought that they were working on that, because all the X, Zv4, Zv5, NSv3, NSv4 all have the same suggested box specs.

If the sub is flopping around like a fish out of water when your playing higher notes then you are unloading, unloading will typically be caused by 1 of 3 things or a combination of those things. Too much power, to much port, or playing out of tuning frequency. I personally don't like the port area by wattage method because things just like this happen, and that is why I prefer the per cube method. It only seems to work good in more of your SPL style builds where your only playing 1 frequency. You get to a point where too much is too much and you start to lose output. Ideally you want to take the sub(s) cone area, xmax, enclosure size, and applied power into consideration when figuring out port area. For a free calculator WinISD is great there is a graph for port velocity on there, its worth downloading and learning, or if you need something more basic Torres works decently well too but wont give you any port velocity numbers. Port velocity isn't that bad as long as you stay under 10-12% speed of sound. Depending on the setup and how the sub(s) and port are oriented you may not hear port noise at all even if you have a really high port velocity. For example a a box in the trunk with everything firing towards the rear of the vehicle.

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