Vibration Issues / Turntable Decisions

Wall mount is an option, but ideal because I have molding that runs around the room at the ideal height so the TT would be quick high and look out of place.

Currently it is sitting on a Marble topped console, but the issue is the room is over a crawl space on wood floors, so shockwaves from walking are quite pronounced and travel well.

You could try isolating the table on a sub shelf on something like these https://www.audiogon.com/listings/tweaks-townshend-audio-seismic-isolation-pods-isolation-feet-2017-... 

i also suspect the marble surface is making the problem worse

Do not get rid of your 150, as you have it modded, will be hard to beat.

If you can absolutely not use a wall mount, you could also try securing the backside of your stand against the wall by wedging a piece of wood between it and the wall. By doing so it provides a secondary plane for stabilizing the stand and will eliminate 99 percent of the floor wobble. If that works you can then make an adjustable one using a piece of wood, a large bolt and a nut. The cost would be just a few dollars. You would use any shelf side facing the wall on the stand as the anchor point. The higher up the better, but I have had success using lower shelfs, too.

Secure your supporting table to the wall behind using a turnbuckle, a piece of wood of appropriate size, etc. This has cured many of these kinds of problems.  When this is corrected your next step would be an Ortofon Black.