You're not quite right there. In the PHB, Tides doesn't reset on random (1 on a d20) wild surges. It only resets when you've used it and you cast another sorc spell, at which point the DM can decide you trigger a surge (no d20 roll needed).
I understand there's no DM in this game, so having it reset when you do roll the 1 makes sense. I actually think your odds should go up to 25% for triggering a surge when you've used Tides – to simulate the DM being keen for you to roll on the table. That way you have a better chance of getting your Tides back and also seeing more surges.
It's worth noting that in the PHB 80% of surges are benign or beneficial, and only 20% are detrimental...
