Connecting another set of wires to track or soldering?

[RobertInOntario]

I've just successfully isolated two sections of the inner loop on my small 4x6-ish layout (see <!-- l --><a class="postlink-local" href="http://www.the-gauge.net/forum/viewtopic.php?f=17&t=6194">viewtopic.php?f=17&t=6194</a><!-- l -->).

The layout is working OK but I'm still ironing out a few bugs. The main one is that -- on the right-hand half of the layout -- the current strength is noticeably weaker. This is because the R/H side of the layout is kind of cut off from the power source by one of the isolating gaps in the track (which is near the front of the loop) but on the back half there are two turnouts. (The power wires are connected to the L/H side of the layout.)

So the current is strong on the L/H side of the layout but weaker on the right. There, the locos either stall or slow down.

Is the best way to solve this to join another set of powered wires to the R/H side of the layout or could I solve it by soldering more of track sections (around the fishplates)?

I'm loathe to do the former b/c it's a messy job (the layout already has ballast & scenery) and I want to minimize the number of wires around the layout.

Thanks in advance for any suggestions.