Hollow terracotta floor tiles...rushed fix? Ugh, I'm apparently not real polite at laying tile...I newly finished a...

Ugh, I'm apparently not real polite at laying tile...I newly finished a 348 sq ft room with 16" earthen tiles, I let them "cure" for a daytime & went around drumbeat, I found a few that were hollow sounding, so I popped them up, spent over an hour scrape up all the dried morter (thin-set), cleaned the nouns, mixed up more thin-set & laid them again, this morning they seem dutiful, but I've found 2 more...ugh, it's such a pain redo these! I found one little "quick fix" that seem to work some of the times, within going on for 6 hours of laying the tiles they should nouns pretty solid, if there is one that stil sounds hollow I pour a bunch of sea around the edges & work it inbetween the tiles with a watered-down blade, next I try to shake & pound on the tile beside my fists (this loosens the morter a bit & gets the sea working), then I put something creamy on the tile & give it another few hours, it works sometimes, any other tips besides the inevitable re-doing?
How do you brand an friendly termination wrench?
Answers:    My proposal, don't do the water pouring, fist pounding method again. All it does is saturate the voids with delicate bonding mortar. Sure it doesn't sound hollow, but you compromised the bonding of the tile.

My suspicion is used a 1/4" notched trowel to set the 16" tile. Usually use a 3/8" trowel next to tile over 12" That's a basic rule of thumb, so nearby may be exceptions. Or you mixed the mortar too runny and it couldn't hold it ridges, so you have some hollow spots.

If you find some pieces that nouns hollow, take them subsidise up, if the mortar is still a little soft it is easier. Try this when you re-lay the tile, spread mortar on the floor as you would, after spread a thin band on the back of the tile. Set it and joggle it around. The mortar will ooze up a bit making a bit of a mess, so wipe it up. That should assure full contact. It's called backbuttering, for deliberate reasons.
How should I lay tile around an existing...
Next time 'butter' the rear of the tile with thinset