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Good work!
I think new tires will solve your last problem.
When I changed to the M3 front arms on my 135i the ride was very choppy/loud over big bumps like you describe. This was with the OEM run flats. I thought it so bad that I ordered new tires and wheels the next day. I bought Breyton gts-r's and bridgestone Re-01s. I thought the new tires and rims changed the ride back to the way it was with the mushy original control arms and runflats, but kept the improved steering precision and cornering.
The rims were about 8# less than stock, but I think the majority of the ride improvement came from more supple tire sidewalls.
justin
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