Good combo or no?

WG DGS is just that a paint sealant it is in no way designed to remove defects it's just a paint protectant (same as wax just man made). Klass AIO really doesn't remove defects either it's main purpose in life is to chemically remove oxidation. Any paint correction would be from the pad being used, if a buffer is being used at all. For yellow Klasse AIO (for a clean oil free surface) and WG DGS is a great combo to use.

Here is what KAIO/WG DGS on a well prepped paint surface looks like on crystal white (about 85% of the clear coat scratches removed)

Well I used the Ultimate Detailing Machine aka UDM (a copy of the Porter Cable 7424 Buffer/sander with a stronger motor) and a light cutting pad (orange in color) with Menzerna Super Intensive polish (SIP). The combo removed a lot of the scratches with just one pass (3/4 minutes for the polish to break down in a 2x2 section). You can not get the same results by hand believe me I tried before buying a buffer and pads.
In order is goes:
Wash
dry
Clay bar-Advance Auto/Auto Zone carry Auto Magic Clay Bar kit.
Rewash-Option; Just to make sure there is nothing on the paint.
Menzerns SIP/ lite cutting pad @ speed 6 on the UDM
Klasse AIO-to remove any oils left on the paint
WG Deep Gloss Selant
Before *Notice fine CC scratches*
View attachment 329254
After (One pass with SIp and Light cutting pad*
View attachment 329255

Good Luck it's not cheap to get the right tools and products but pulling up to a 99+ and looking better feels great. Plus if needed I can ask top dollar for mine just because it looks like new paint/mint condition car.