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Hi Starcrazy
Paul has given you some good advice there, a couple of other things you might want to take into consideration. You do need to mount your guidescope on a solid base and preferably with guidescope rings so you can adjust as necessary to get a good guide star. I note that you have an LPI, if the EQ-5 mount has an ST-4 style autoguder port, you can auto guide through there, there are free program available for that ie GuideDog and GuideMaster, it is not a difficult setup. You say you have some drift in RA, try placing the couterweight so it is slightly holding against the worm, that way it is driving against it, having the scope perfectly balanced can cause some occilation which will end up as you chasing the star back and forth. PE (Periodic Error) could also be a problem as well, that is a mechanical issue.
I guide without any problems using a ZS-80 at f/6 using both an LPI and ST-4, my main scope is f/9 although my mount is a G-11, I successfully used this setup on a GM-8 which, as I understand, similar to the EQ-5 in capacity. Most importantly, don't overload the mount, you should never exceed 2/3 the capacity.
Keep trying, you will get it.
JohnG
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