I have the Ireland 284 regrind in my '89 535. It has a little something; Ireland offers a 292 which would require oversized eccentrics. It would seem to be what you are looking for, at a hella good price. https://secure9.nexternal.com/shared...unt2=854896187

I think custom pistons would be the way to higher compression. There was a set of m88 pistons on ebay recently that a few of us were watching; I question the wisdom of a rebuild with used pistons, but they looked very good in the auction. Most bmw tuners/rebuilders want at least $1,200 for a set of high compression pistons.

I do agree that more compression should really wake up the m30.