Quite a few English grammar books are now sold at big bookstores in Japan and I know some private high schools started to use them as a main textbook instead of officially screened English textbooks. One of the most well known titles might be "grammar in use" and it's highly recommended among tadokers, too. It's a bit heavy^^; and thick, so I'm easily overwhelmed with its feature and have never done all the way through even I hold three different versions of it...
Once you finish studying English with those kind of grammar books thoroughly, then it's quite understandable for you to expect that you can use the knowledge of English grammar in real life. But I highly doubt by now that the gap between having basic knowledge of English grammar and being able to command it well might be much wider than you imagine. Can your brain retain all the rules till the time you use them in the future? Do you think all the rules you learn from textbooks are indispensable for your need of using English?
Again I have to emphasize here the importance of having a clear objective to study English and also the benefit of using English in real life from the early days of your learning as you study with those textbooks. If you're aware of why you study English and what kind of English you need to acquire to reach your goal, then you can tell which words/phrases and rules you need to learn well and which you don't.
What's for learning complicated past perfect expressions when you want to chitchat casually with your friends. You can go with simply using past tense only. I'm sure your friend can tell that you're talking about something which is supposed to be expressed with past perfect tense from other additional information.
As for the benefit of using English, I think writing English from the beginning is crucial to enhance the long term memory for remembering the complicated rules of English grammar. You start to write what you really want to tell, then you run into some expression which you're not sure if it's correct or not. Then is the time your memory is strengthened. You look up words in a dictionary or refer to some textbooks, and then use what you learned right away in your writing. You're unlikely to forget words or rules you learned in this way.
I'm not saying you shouldn't use any textbooks and do only tadoku, but maybe it's better to find a better way to use textbooks for your own need, then you'll be able to make the best use of them.
言いたかったのは、受動的にテキストやるより、writing して能動的な活動をするほうがいいんじゃないかなってこと。 ちゃんちゃん