Sub Sonics and woofer pumping

Last_lemming are the woofers pumping at normal listening levels or just when you turn it up?
The Nagaoka is very stiff and we really do not know where you are.
It would help if you could get the Hi Fi News Test LP. Then we can know for sure. It also is a lot of fun to test other parameters. Very Useful.
Here,  https://www.amazon.com/Tonearm-Headshell-Cartridge-Weights-turntables/dp/B01B8ONJVI and  https://www.amazon.com/Ultimate-Analogue-Test-Lp/dp/B001GBA71Y/ref=asc_df_B001GBA71Y/?tag=hyprod-20&linkCode=df0&hvadid=312149562874&hvpos=&hvnetw=g&hvrand=501746434509243117&h

Woops Wrong test LP. This one  https://www.amazon.com/HIFI-NEWS-Test-Producers-Cut/dp/B00KMCL1PE

another option is get a phono stage with an effective subsonic filter - higher lehmanns have that feature for example

but other advice is spot on... best to find the source of rumble, but it may be coming from the TT/cart itself coupled with records

Not that I think it’s relevant to your immediate problem, but increasing the weight of your counterweight actually has the paradoxical effect of reducing the effective mass of your tone arm, because effective mass is affected by the square of the distance between the pivot and the center of mass of the counterweight. Therefore, when you went from 140 g to 180 g, you then moved The counterweight closer to the pivot to reset VTF. Thus you reduced the quantity that is squared in the calculation. You actually would be better off to use a slightly lighter weight counterweight and move it further away from the pivot. If you want to increase effective mass.

As to your immediate problem, absent undetected and unknown problems with your equipment that none of us are privy to, I suggest you need to move your turntable to another spot in your listening room, and see if that helps. Putting it on the floor like Miller carbon suggested is also a reasonable idea, but put it on the floor in another part of your room, if you can.