Bobcat, my hydraulics experience is only a few years (on remote manipulator equipment, very fussy stuff) and I won't question your statements, but... are you speaking of pressure or flow? And what absolute drop are we talking about here - that is, what IS the pressure drop of 20 feet of line? I also understood (from the engineering team I worked with, who dealt with both generator-engine lubrication and the HP hydraulics side), that high pressure stuff and the relatively low-pressure, high-flow lubrication hydraulics are completely different animals.
Overall, I'd say extending a 50-60 psi oiling circuit with ten feet of perfectly smooth line has more negative effect alone than the addition of a few smooth-bend angled fittings, not to mention all the jinks and twists of the
oil remote blocks and the cooler. But I could be wrong. In any case, I do mean the smoothly swept Aeroquip stuff, not angle block fittings.