I'm currently also looking at decompiling android apps and understand a bit of smali. If you send me the apk I might look into it.
If you want to do it yourself, I recommend apktool_m on android. It includes all tools required to decompile the app. It can even show a partially correct java code in apps that are not obfuscated.
75c is impossible on a gaming laptop if you dont have a low power gpu (eg max q)