Congrats!
Your CH is fine, no need to worry with a vinyl liner. Your TA is close enough, but you need to bring your pH up over 7.2 ASAP. Your FC is under 10 so that reading is accurate.
It is safe to swim though the low pH might sting your eyes. I would get that up first but it is a comfort issue, not safety.
Figure out what your CYA should be based on what you added already and look up the correct SWG target on the FC/CYA chart. Once your FC nears that then fire it up and try to dial it in to maintain that target. In a week you should verify your CYA, adjust as needed and adjust your target FC. Once you get your CYA where you want it and your SWG maintaining the target FC things should run well with only testing and minimal upkeep from you.
Great job on your first SLAM!
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