Patience is important, but so is asking questions when something is unclear.
In this case yeah, you were right to ask. At this point there are a number of different ways you can go about this, depending on what school of cycling you subscribe to.
Since you are already using Dr. Tim's stuff, he does have his own guide to cycling:
https://www.drtimsaquatics.com/resources/fishless-cycling/
At this point according to his guide you just have to keep on waiting until nitrite reaches 0. Only then do you dose ammonium chloride again.
Despite believing this to be the 'proper' way, I am pretty impatient and would personally dose 2ppm ammonia and see what happens with nitrite, just as a test that nothing is wrong. Presuming ammonia is consumed, there should be some change to nitrite. If it still remains exactly at 1ppm, something may be wrong - not necessarily with the cycle itself, but perhaps when testing. Not shaking a bottle vigorously enough or something.
Others will say you are pretty much cycled now, and that nitrite at 1ppm is okay or similar, because it is true. Nitrite is not nearly as toxic to marine fish and stuff compared to freshwater fish:
http://reefkeeping.com/issues/2005-06/rhf/index.php
Not 100% certain about shrimps though. In the article above Dr. Randy Holmes-Farley did talk about nitrite and its effect on inverts, which seem to be fairly unaffected. But personally I just like to be sure my nitrifiers can handle all the ammonia and nitrite produced, just to be sure.