My secret? Well, not really a secret but I took 4 wood screws and inserted into the base holes. Give them a couple of turns until they grab the top of your layout. Now start backing off on the screws and playing around until find the optimal setting so to speak. It's all trial and error so give it a shot. This worked well for me.
My 362 has worked perfectly for years.
And as noted above, variable voltage is key. Again, trial and error.