hi cricket
i had just typed u a big post but i lost it..... and i am being lazy so this one will be shorter but i hope still useful.
have heard spinning babies website is good for optimal positioning exercises and positions.
so maybe try that out.

from memory i think being on all 4s is good, as is sleeping on left hand side and pelvic rocking.
try to avoid reclining on couch and lying backwards...

my baby is head down on LHS (good baby) but OB did mention to me that they can move around til about 36 weeks (and even after)