No one can give you any guarantees. We have Global Entry and TSA-Precheck (you do know that Pre-check is never guaranteed). We've made a 1 hour connection in SJU (coming back from the Caribbean) a few times and missed it a couple of times.

The point is 1 hour it is cutting it very close and if you encounter even a slight delay all bets are off. What happens the day you travel will depend on what Murphy's Law of Airports has in store for you. Murphy clearly states the shorter your connecting time the greater the chance your inbound flight will be delayed, you arrival gate will be "occupied", there will be multiple jumbo jets arriving in the immigration/customs hall the same time as you, the immigration computers will crash or your Global Entry will flag you for further review, you'll be singled out for a thorough customs inspection, the TSA lines will be extra long and the Pre-check line will be closed and the gate for your connecting flight will be at the farthest reaches of the terminal.

On the other hand, if you opt for the longer connection you'll be virtually assured , your inbound flight will arrive early, there will be virtually no lines and/or waiting at immigration, customs & TSA, your gate for your connecting flight will be right opposite the TSA checkpoint and your connecting flight will leave the gate 30 minutes late.

All I can tell you is if you stay with the 1 hour connection time expect the "best" - prepare for the "worst". Good luck!