I needed side panels for a chest on chest. I joined 3 boards each after running them through my jointer and planer. I used biscuits to join them but there are still a few areas where the alignment is off by 1/32 to 1/16 of an inch. I have 3 planers: a BUJ (approx. 22") a #4, and a low angle bench plane. The blades have been sharpened down to 13,000 grit so they are sharp. I am having difficulty getting the panels completely flat. I have planed from all sides, the BUJ just skims over the surface, and the #4 is not much better. Starting to attack the variation with the LA bench plane. Am I making a mistake in how I am going about this?