So ... not to sound like I can't make up my mind
but after reading the product data sheet for Laticrete 317 that says:
"LATICRETE 317 must be fortified
with LATICRETE 333 Super Flexible Additive or LATICRETE 3701 Mortar Admix for exterior use, porcelain
, mosaic, glass and stone tiles, and heavy traffic areas."
I'm starting to question the wisdom of using this mortar over Ditra. I understand that modified/unmodified mortar over Ditra is hotly debated and that Shluter recommends unmodified but everything I've read suggests that modified is stronger for porcelain so long as you give it adequate time to dry before grouting. As a DIYer, time is something I have plenty of.
So if I can give it a week or two to dry before grouting, why shouldn't I use a modified thinset that Laticrete recommends?