Yep, I use diodes/bridge reçtifiers to drop the voltage along mine.
Not active right now, but a track pressure trigger at the upper level triggered a relay to add or remove them. I barely need 6v for anything downhill.
I replaced this with a Z . Each dial(4) is one block. But the up and down blocks usually get set then left alone. Actual throttle change is done mostly on the level portions vs on grades. The 4 blocks are , grade#1, upper level, gràde#2, lower level. It allows for handsfree looping no matter what I run. You have plenty of time while on a grade to grab either upper or lower throttle.
Test that curved grade asap. Curves are best done flat or with little grade. It causes a twist and some locos (esp. 6+ driver steam)can't keep all wheels planted. It needs super elevation to stay planted. (think of a roller coaster. It either tilts in curves or curves flat, then climbs/drops after the curve.)
