Your thoughts are common for those who want to keep their faith in the Bible. The JWs tried set themselves up as the most rational when it came to Bible doctrines. This was especially true of Russell. You could even make a good argument to show that his reasons for believing nonsense (like prophetic dates found in pyramid measurements) were rational.
I'm sorry to make this so long, but I think I need to back up a bit into the JW history to make my point. A lot of this is my own conjecture, but for me it helps explain a lot of things about the confusion we have when we first try to pull ourselves away from the JWs.
Russell started what he thought might be a new "NON-religion." He was only 22 when he looked for and began collecting a very appealing theology for non-religious Christians and "almost-religious" Christians. The people it attracted were confused about the obviously irrational definition of a Trinity, the irrationality of a God who tortures people in hell, and they needed a more rational explanation for why God permits wickedness. Most other Christian religions were just going along with "accepted" Bible evidence, and Russell was collecting "less accepted" Bible evidence that led to different conclusions. Almost all of it was from other religions and commentators, but for someone so young, Russell was very well organized in his thinking and business skills, and, of course, very talented as a writer and speaker. In some ways he did the Christian religious world a "big favor," in the same way that Waldo, Tyndale, Wycliffe and Luther had supposedly done by bringing a more rational, explainable religion to the "common" people who saw the bigger religious systems as irrational. Russell (and those others) knocked away at the pretensions of the clergy and priesthood who spoke in an incomprehensible language.
Lest anyone get the impression I'm a Russellite, I think Russell developed a very sophisticated form of haughtiness, especially after 1896, and around 1904 or so, it led him to dishonesty, especially around the time of the Russell-Eaton debates. (If anyone has evidence of dishonesty before 1904, by the way, I'd like to hear about it.) Rutherford appealed to an even less religious crowd. His NON-religion was managed as a company of book sales, of campaigns and quotas, sales talks and booming pep talks. (Also, he was able to hide extreme politics behind a cloak of "neutrality.") It may have been an accidental stroke of genius, in 1935, to start attracting people who wanted to feel important and special, but who knew they didn't quite deserve heaven.
So the JWs still use a foundation that is very rational from the perspective of the type of person who was attracted to it in the first place. That doesn't mean it's completely Biblical. There was evidence in the Bible for the exact oppposite of JW views, too, in most cases. And they've obviously heaped a big smelly load of stupidity on top of a fairly rational foundation.
I know this confuses a lot of people. It confused me for years, when I thought I should continue working from the inside to try to help break down those doctrines that I thought were wrong, but could somehow leave the foundation. I know this probably won't help much unless the specific doctrinal issues are also addressed, but I've run on way too long already.
Gamaliel