Still slight hesitation after fixing the intake boot?

[Interceptor]

As some of you might know, I've been fighting this problem for months now.

The simptoms are following:
- slight hesitation at lower RPMs (<1500)
- slight overall loss of power
- above average fuel consumption

After I fixed the rubber boot it got a lot more responsive, but it's still not quite right. Before this problem occured, I could start moving by just releasing the clutch moderately and the rpms would not drop. Now when I try that, it lowers the rpms a bit and then resumes. And another thing - when I put in reverse and let the car roll on it's own without any throttle applied, the movement is a bit jerky, not smooth like it used to be.

I've recently changed the following:
- oil (engine, brakes, gearbox & final drive)
- filters (oil, air & fuel)
- fuel pump
- injectors
- spark plugs (Denso Iridium - but the problem existed before them)
- intake boot + 2 vacuum hoses

Any help/tips/suggestions from the experts?

P.S. What's the other hose (the longer and wider one) that connects to the rubber boot for? It's not shown in the same picture with the rubber boot, only the smaller one is (see pic). Both the hoses connect to the rubber boot using plastic connectors and are located on the lower end of the rubber boot near the throttle body.

http://www.realoem.com/bmw/showparts...81&hg=13&fg=15

I would have taken pictures but it's raining as hell here for the past few days and I do not have a garage