Congratulations buddy, no attempt is a futile attempt. Your Quant is very impressive. However, verbal needs a lot of fine tuning. Manhattan SC is the bible for strategies for the SC questions. Learn them, imbibe them, look for them in every sentence you read and keep practising. Personally, I must have been in the early to mid 20's level when I began my preparation with OG 11 and then OG verbal but by the time I knew of
MGMAT SC book, I had exhausted all the OG questions twice. I'd suggest, work away from OG for a while, if you have done that already and come back later. Learn the strategies and use them on 1000 SC for practise.
Kaplan CR and Powerscore CR are both good. Kaplan distinguishes exactly the styles of different arguments, so when you read the stimulus, you know what specimen of which category you are looking at. PowerScore deals strictly with approach. Looking at words to identify certain aspects, among stimulus or the options and everything else etc. I'd suggest to go with Kaplan if you are an able reader or otherwise go with PowerScore if your reading skills are poor and you need someone to spoon-feed you with every trivial thing of the approach. Again, practise on 1000 CR questions, when you think you are doing better, go for LSAT CR, at least I have noticed many members of this club doing that.
For RC, browse a couple of websites that deal with RC strategies. There are not many of them applicable and RC is supposedly the easiest because you should always be able to go back into the passage to find answers.
All the very best, participate more in this forum and do let us know your improvement.