EXS 24 Logic Sampler Users Group

Hi list,
I\ufffdm currently building up a song around some drumloops, a thing I did with
Acid easily before, but now I want to do it all in Logic. The drumloops
originally come from some Akai CDs, so I loaded them in EXS and played them
from there. Now I realize that the loops\ufffd beats and my song metronome start
running apart from each other after a couple of measures (I guess the
drumloops are not exactly the stated bpm).
I have some ideas how to fix that, but because I\ufffdm a Newbie I thought I\ufffdd
ask the Pros how to handle this (and save some time :-)  ), and maybe get
some general hints on dealing with drumloops:

Is it a good idea at all to play drumloops from EXS or should I put them as
audio-tracks in Logic and loop them from there (for using Logics
loop/tempo/timestretch features...)
If I have them in EXS as a single looped sample, what are your experiences
with commercial sample CDs, can I trust the stated bpm numbers or will I
have to re-edit many samples myself?
If I have a perfect "round" loop in EXS which is only a few cents
faster/slower than the song tempo (on the long run), would it be a good idea
to "retrigger" the loop every few measures?
Is there a difference (timing-wise) between a) having the loop in EXS as a
one-shot sample and looping the part from Logic\ufffds arrange window or b)
having the sample looped within EXS and have it as one long part in Logic?
Or is it generally speaking recommended to "slice" up each drumloop and
trigger the single sounds via Midi - like I believe I could do it with
ReCycle (didn\ufffdt try that yet..)?

Maybe these are very basic questions, and I guess I could finally reach my
goal with any method, but how do the Pros do it?
Any short hint appreciated!

Thanks, Tora