Rear Finish Mower problem, what to do?

[ns_in_tex]

We purchased our First Choice GM35-84 rear finish mower in 2002. I think it was made by Sicma in Italy.
It was our third rear finish mower and have expected it to last the remainder of my life. First two were Woods and Bush Hog.
We have worn out, and replaced, maybe, four sets of blades, and one set of solid tire wheels plus one belt set.
Lately, we noticed it looks like one side is cutting shorter than the other side.
1. Installed new set blades, still same problem.
2. Set mower down on level concrete floor.
3. It shows to be level from side to side, across top of frame that wheels mount to.
4. Deck measures same height from floor on both front and rear corners.
5. Stretched string across under deck in line with outside spindles.
6. Two outside blades measure 5/8" higher on outside than inside. Measures same when blades rotated 180 degrees.
7. Removed drive belts to check play in bearings, left side tight, right side can move outside blade tip up & down, maybe 1/8".
8. With level on each drive pulley, it shows off level in the same direction as the blade showed with the string.(up on both outsides)

My thinking is that all three blades should be level.
Only way we could get above stats, is the deck is bent at spindle mounts.
Cure would have to be either shim spindle mounts back to level or bend deck at spindle mounts back to level. I lean towards bending deck back to level.

Another question is, if both outside blades are cutting higher on the outside, why does my grass cut look different height at edge of each pass?

Has anyone had similar problems or have any suggestions for something we might be missing?
Thanks,

 

[TractorGuy]

Sounds like a spindle bearing issue if the deck is not bent. Turn the spindles by hand and see if you hear or feel any bearing noise or roughness.

 

[ns_in_tex]

Sounds like a spindle bearing issue if the deck is not bent. Turn the spindles by hand and see if you hear or feel any bearing noise or roughness.

Item 4 above is deck measurements at outside edges of deck, which I think rules out wheels, spacers and deck frame, along with most of the deck.
I think Item 7 above would mostly rule out spindle bearings. Although we will probably install new bearings in right side since it has 1/8" play at blade end, while left side was no play. Left side bearings were replaced 4 years ago, while right side are original.

My thinking is deck is bent just at the spindle mount area, unless this mower was designed for blades not to be level. Both outside spindles do seem to be similar tilt. (outside of blade up). Level on belt pulley's indicate same.