Wunderhorn,
Your welcome to disagree with me. But you're objectively wrong to say that Chailly's cowbells sound like bongos. Why? Because they're not bongos, they're cowbells - that's what cowbells sound like. If, what you're protesting, is that they sound too far forward too you; well, you're entitled to that opinion, but it's not one that I necessarily share. Assuming that you mean the passage leading up to the movement's climactic passage; well, it's mostly just the horns that are doing much of anything at that moment. For the most part, the harmony is simply ascending step wise. Once the harmony reaches a certain plateau (I don't remember what key - I'd have to look it up), the cowbells cut out; and that's pretty much where the strings take over. I don't really see where anything important in the strings is being covered over. If that were a genuine concern, Mahler would not have called for on-stage cowbells, played fortissimo. Look - I'm just being the messenger here! These are musical facts, based what's on the written page. If you think that they're too far forward sounding, fair enough. But please, don't make it a personal issue - I'm just a messenger of what's on the page.
Now, if you're connecting the dots, and assuming that because I'm defending the cowbell balances, I'm therefore presenting the entire performance as being the best - I'm not! Didn't I say that I actually prefer Gielen's M6 instead (well, I did somewhere)? I'm also sorry that you're not liking the Chailly cycle in general. I still like it more than the Gielen cycle - an issue that also has to do with cost, and the exclusion of Gielen's Mahler/Cooke 10th. I still endorse the Bertini cycle as being the best one overall. I also think that both of Bernstein's are very good; the Sony one being slightly better. Tennstedt shouldn't be entirely discounted either, although the sound quality isn't always the best.
There's one other issue that comes to mind. If you're possibly thinking that small, "tinkly" sounding cowbells represent authentic cowbell sound; well, it doesn't! If you go over to the Alps and the Austrian highlands, cows wear fairly large bells with a somewhat lower pitched sound. Because they're in groups of large numbers, you can hear that sound from miles away. The Vienna Phil. has very similar sounding cowbells. Anyway, I'm sure that that was the sound Chailly was after; although, the cowbells belong to the orchestra, not him. But he might be presenting them a bit too far forward; true. My belief is that the cowbell sound is supposed to be very, very disturbing at that point. I don't believe that it's meant to be pretty or pastoral at all - not even in the slightest. Now, that - I'll fully admit - is an opinion and not a fact.
"I also dislike the finale, it needs more rythmic definition like Abbado's with Berlin, very strong rythms".
Absolutely no argument with your reasoning there. Although, I would urge you to take a second listen to the last ten minutes of Chailly's finale. The final allegro "charge" is done superbly well, I feel - every bit as good as it is on the Abbado. Also, if you check out the very, very, VERY end of the symphony, I think you'll be impressed with Chailly's sense of rhythm there. He takes that final A-minor outburst very slow, and VERY rhythmic in the timpani. Before you throw out the baby with the bathwater, do yourself a favor, and just listen to those final ten minutes again. If you don't find something to like within those ten minutes, I'll eat my hat.
Barry