Please Help! Something is killing my Belle

I have many yellow leaves on my Belle du Jour. What can it be? I noticed tiny bugs while using a magnifying glass, on the underside of the leaves of some other hibiscus that I have, so I sprayed everyone. Actually I saturated every single inch nook and cranny on every plant I have 3 days ago with Bayer Rose & Flower insect killer. They all have been sprayed with this a bunch of times, as well as Neem so I don't understand how they are not protected. After I sprayed them, I let them dry, and the next day I blasted them all with the hose, top to bottom. Could this just be left over spider mite damage that will right itself? Should I now spray with Neem? I also have yellow leaves on my tiny Gabriel. And some starting on my Cajun Blue. I shouldn't have any nutrient deficiency, I use exactly what HVH suggests. Does anyone know what I'm doing wrong??

Several photos to follow.

so much yellow

And another of the top of the leaf

the underside of the leaf

Gabriel

A week ago Belle looked like this, with some yellowing starting.

If you bought it from HVH - I'd suggest sending Charles or Cindy an e-mail with these pictures. Course if it's spider mites - it may take a while to recover. If the damage has been done by them and you've sprayed - you'll just have to wait for new growth. Once a leaf starts yellowing - it's pretty much history - so I remove the leaf completely. Typically I think the recommendation is the Bayer 3 in 1 spray. Be sure to spray the soil also and keep up the regimen of spraying every 7-10 days for at least a few weeks. By then you should start seeing new leaf growth. Good luck!