One of the weakest points of experimental aviation is the attention paid to getting the electrical system right. Over the last decade or so, even the FAA has been increasing its emphasis on aircraft wiring.
You don't have to invest in new products or invent ways of wiring things--industry standard practices born from collective lessons learned are easily available from what SHOULD be an often-referenced document: Advisory Circular 43.13.
Chapter 11 relates specifically to electrical systems. Everything from wire sizing and bend radius allowance to the spacing for cushioned clamps, from service limits to EMI, to moisture protection and service loops is in that chapter.
I'm surprised this reference isn't higher in this thread. The 43.13 should be the minimum standard from which we experiment to improve.