Guys, thanks for all the input so far. Well, thing is, I'm renting this house right now, so am weary of following any serious DIY type solutions (ceiling mount, or wall mount). I'm also weary of checking out other stands, as I've alreay invested heavily in this one and it really is a beauty (will need to post photos soon - camera is not on hand just now). I guess I could revert to the concrete blocks I once used, and place them in/under the rack (just move one of the rack platforms to the other side of this double rack, and realign) - that might work - could keep all the equipment together (not take up fresh real estate, and maybe eliminate the jumping issue, and the tt would be lower, which is a good thing). Still, I may lose some of the stand benefits I'm getting - if there are such benefits (still not sure just how effective the Adona rack is - but I'm bad at judging such things). Also, the tt looks great perched up there next to my Supratek preamp - both of them showcasing all their wood :-)
Just to metnion, the whole rack is placed upon a brick floor/patio, but I'm not sure where the joists are under all that. Also, I've really no wiggle room to place the rack elsewhere - it really needs to sit just where it is, because I've a projector screen which comes down right next to it - if the rack is an inch away from the side wall, it begins to encroach upon the projector screen
Well, I'll try a few things and keep you posted. Thanks again guys for all the good advice.