You can add as many lockons as you need to distribute the power to your layout.

If you do not have a multi-meter to check for voltage drop across the track sections, use a lighted car, or just a bulb with pigtails. Check each section of track and when you get to a section where the light is dimmer, pull that section out and pull the pins out and clean or replace them. Rust inside the track is more difficult to clean out, so it is easier to just replace any like that.

You also need to clean the track and all the wheels of all your rolling stock with Naphtha. Do not use the acetone, as it will melt any plastic it comes in contact with.

Larry