Hi, and welcome to the forum!!

You can take the pH reducer back--your pH needs to be in the 7.0 - 7.8 range, so it does NOT need to be reduced. Don't worry about TDS--that's mostly just a scare tactic to get you to buy something to reduce it. Ignore it. I would stay away from any algaecide that they try to sell you, unless it's polyquat 60--and even then you really don't need it unless you have a metals problem, are closing the pool for winter, or have some other reason that you have to keep chlorine low. Any other algaecide will just foam up your pool and create more problems. Honestly, chlorine in proper levels is the only algaecide you need for regular use. Your alk is fine, you have CYA being added now, so it looks like you just need to let your filter do the work. As you're filtering, do you see your pressure rising? Don't backwash it until you see an 8-10 psi rise--but if your pressure isn't rising at all, you need to let us know that, too.

What size pump and filter do you have? Do yourself a HUGE favor and get your own drop-based test kit....we very highly recommend the K-2006 kit that can be found online at the link in my sig. Other than metals, it will test most everything you could need, and will keep you away from the pool store scare tactics!!

Looks like you're doing a great job so far, just stay the course and add a big dose of POPP--pool owner patience and persistence!!