Overall, I think you did fine. One packet of s-04 is probably slightly underpitched for that batch size and gravity, but not by a lot. Also, you took the extra care to rehydrate the yeast prior to pitching which should help it out in the long run. I personally would use sterile water for rehydrating but Fermentis' literature says 'wort' so you should be fine.
Hold on... I just noticed you said 16.5g which would be plenty of yeast for that batch (i.e. correct pitching amount). Of course, I've never seen a 16.5g sachet of s-04 or us-05
You'll have something good if you keep your fermentation temperatures around 64F (+/- 3F). Not the ambient room temperature but the actual fermenter at this temperature.
You've done good, BUT you need to KEEP doing good