mmmm...... it does seem to have changed.
I'm almost sure the FCOM used to say for CFM 320/21 that full reverse should be used on the live engine unless the X-wind was greater than 15 kts, but my CFM 319 Fcom now says that in the case of OEO, 'the use of reverse is recommended.'
Not sure when it changed and I don't see why the advice should be different from IAE to CFM and within the 320 family.
Someone will know!
Cheers,
mcdhu