The front grill guard is tight on my 2210 and I have left it that way. Not only is it a great workout to fold it down for battery access but it also never rattles. ..
The lift tab for the mower deck was a stupid design. I notice on Case IH tractors the lift tab is upside down "U" shaped. I had a problem with my tab slipping past the lift arm when I first got the tractor. Called the dealer and he said he forgot to give me the spacer bar to hold the arms apart and he was embarassed about it and I was disillusioned by Deere's poor design. I solved the problem with getting Imatch so I can just leave the dam turnbuckles tight and not monkey with them. So in short if that tab slips tighten your turnbuckles!
the pic of your lift tab looks normal to me ... may be a matter of the weight of the box is so much that any movement at all is enough. Is there space to insert machine washers on the outiside of the box to spread the arms slightly?