I would never go back to drums. Mabey in Cali where they won't rust, but those things turn to giant pieces of flaky unbalanced as pieces fall off rust in no time here in the rustbelt.
I used a Brazilian S10 Hydro & master circa 2003 and I put an adjustable prop valve in the rear line in addition to the regular safety prop valve. I used caddy calipers. I'm not sure why all the whining on the caddy calipers, I've not had a single issue with them, it isn't the best parking brake, only holds on slight to moderate inclines, then again, I'm not sure it ever held a caddy on a steep hill either. But it does hold on most inclines one would park on and it works fine as an e-brake.
I did paint mine completely with a high quality high heat paint, and I keep the e-brake mechanism lubed and I back up hitting the brakes hard, this seems to work well at keeping them adjusted. Barring that, I think the driveline brakes do a much better job (albeit most are not legal as an e-brake for on-road use by gov't standards, for whatever reason, then again caddy calipers swapped onto a 3/4 ton axle swapped into a K5 might also not be kosher with the feds either!) and the driveline brakes are readily available now.
I also adjusted the adjustable prop valve so the rear locks up at the same time as the fronts on a hard brake on a somewhat loose surface (gravel or ice).
I also have all heavy stainless steel hard and soft lines (braided soft), no pudginess anywhere in the system. Circulating the hydro fluid, I have a heavy duty PS pump from a D-max truck, although I don't think much has changed in those in 20 years, mabey better quality seals. I only used it because the can on it fit perfectly in the serp setup I have, clearing everything and giving good access to the PS fill and had the I/O for the fluid lines in the right places for my setup.
I think my unique hydroboost/master may be the ticket. The older systems found on the K30's and what not just weren't as good, or were too heavy handed. The S10 system used in Brazil is just the right size, I think, and I LOVE the way the pedal feels, very confident braking on and off road, 0 fade, nice consistent pedal.