I think the main issue with the Sentry Ooze is that it gets Wis +10, Cha +10 for racial ability adjustments for only CR +2.  That’s something that works out when applied to a standard, mindless ooze, but it leads to stats that are a bit obscene when applied to base creatures with higher base mental stats.<br/><br/>I do think Zaer’s on to something with the Living Spell suggestion for a replacement mount, however.  It would just be a matter of finding the appropriate spell to use as a base and maybe pumping up the caster level a bit.  I’ll have to see what I can find when I wake up later today.  For now, though, good night. ^^