The first thing you need to do is to insure focus is correct, assuming you're using a small guidescope for now, pick a magnitude 6 star and an exposure time of 1 second. Take a dark frame (have the 201 powered up for about 20 minutes prior to starting this). With an eyepiece make sure the star image is dead in the middle of the FOV. If you have a Meade 9mm reticle you have a head start because this is near parfocal with the 201XT, otherwise it's guessing time.

Rack the focus slowly until it starts to register sensible numbers, you are aiming for something like 50 @ 5,5. If you get a zero brightness reading within a range of focus positions you have doubtless not got the star on the chip, it's coverage is tiny and missing the chip is easy. You will just have to persevere with this until a particular focus position gives you the highest number for gb. If you seemingly can't get anywhere near focus repeat the operation using a bright star (say, Arcturus). This will be far too bright for the exposure settings but at least it will register even when way out of focus - and you can use the gb number to estimate as you get closer to focus. It will reach the max 99 long before it's focused so you will then have to switch to a dimmer star (if you change exposure time you will need to take another dark frame). Once you have it focused either mark the focuser barrel or (better) make a parfocal eyepiece (about 9mm f/l) to avoid this hassle in future.

A 'hot' pixel will be taken out by the dark frame, but as the 201XT is not cooled you MUST let it reach operating temperature before taking it. Your figures quoted for guide mode are meaningless unless you have a star focussed on the chip. Guide corrections of 91 are moving it the full width of the chip every iteration, guide brightness of 41 without a focussed star image indicate the exposure time is way too long and you're just picking up light pollution (or you didn't take a relevant dark frame).

If you are using an OAG then you will have to get the 'best' focus position you can, the star won't present a nice round image and the 201 may not lock on. It might also be so dim as not to register.