I have this normal metalic wax and the 12 months fusso wax. Get the 12 months version for much longer and superior protection.

Soft99 metalic wax is cleaner wax and the 12 months fusso is a sealant.

Cleaner wax has mild polish capability and easier to use.
Sealant is pure protection without cleaning capability. Harder to buff off (wax off) though.

I have used both white cover and yellow cover as you hv pointed out. The white cover is better

How old is your car and which claybar did u using?

From my experience claying isnt so much about force, but more of repeat rubbing movements. The true test of claying is u wear a plastic bag on your hand and feel the paint surface before and after claying.

There is a possibility ur soapy water too slick, end up your claybar is just gliding on the soap, not rubbing the paint. Try either soapy water that is less soapy, quick detailer, or even just plain water instead.

Not everything can be removed with claybar. Visible contaminants like tar, bird poo, some water marks, tree sap, bug splatter, can be removed by claybar if it is fairly fresh, otherwise if it is there for too long then u may need either other chemical cleaners or polish to remove them.

For stone chips, there isnt much u can do as chances are the chip already crack off paint from the surface. U can try use touchup paint to reduce its visibility if ur car paint is factory original and the touchup paint manufacturer makes your colour. U can go to AEON or AEON Big as they got sell touchup paint. Otherwise, to reduce further stone chips, one very important tip is to avoid driving behind lorries or any cars that their tyres "throw" stones on your car.

For interior, if u are a weekly car washer, then use a damp cloth to wipe dashboard and leather keeps it good for a long time. For protection, use an interior protectant for dashboard and other plastic interiors, and use a leather conditioner and protectant for leather seats and parts.

Hope this helps.