What's the ideal balance (forward/backward) in the saddle on an endurance road bike? I got my first road bike (and found I favor endurance riding position), and I can't figure out if I'm positioned well in the saddle. It's as far aft as it goes, but I still feel like I'm falling forward a bit and putting pressure on my hands. I don't know how much pressure and reaching forward is ideal. I've heard varying advice, like that I should be able to lift my hands a few millimeters off the hoods and still feel balanced, or that I should feel balanced when I'm in my riding-the-hoods position then put my hands behind my hips*. What's the recommendation for best stability? If I were to make an adjustment, it would be either a new saddle with longer rails, or a shorter stem (but I already swapped out my 105mm stem for an 80mm, and I'm concerned any shorter will throw off the handling). What's the general consensus - Should I feel completely balanced in the saddle, or is a little forward pressure normal?
General fit notes: My seat height and leg bend are good, my saddle is already tilted a few degrees nose-up (any more and I'd slide right off the back), the angle of my handlebars and position of the hoods on the bars is good, my KOPS is good, visually speaking the front hub is obscured by the bars, and my hips are as far back on the saddle and rotated as forward as possible without crushing any sensitive bits. I'd rather avoid a professional bike fit, since I'm poor and buying a new stem/saddle won't be cheap.
*Scroll to the section on &quot;COG.&quot; And I'm trying to picture this hands-back position... like Naruto running, I suppose?
Should I feel completely balanced in the saddle, or is a little forward pressure normal?

There should be some weight on your hands when riding.  Not too much of course, but your setup is already slid back as far as it can reasonably be (saddle aft, 80mm stem), and chasing some abstract notion of fit when you're already at the extreme end of adjustments doesn't make much sense.
What's completely missing from your post: what happens when you actually ride the bike?  Is there any specific problem?  If not, just ride.  And maybe think about neutralizing your adjustments a bit as an experiment--if you put the saddle 1cm forward of max-aft, does the bike become uncomfortable?