The wax should not make a huge difference in the cars shine. The ones that do are because of the oils(scratch fillers) in the wax that evaporate in a short period of time. Wax and coatings are mainly used for paint protection (water beading) and ease of removal of dirt on the next car wash. The waxy finish is like spraying PAM in your frying pan. Things dont stick as well so you dont scratch the paint scrubbing them off.
I've been waxing cars for decades and there are no wax, polymer sealant, ect. whose shine (that deep oily gloss shine) will last for more than a few weeks on a car parked outside. I've tried liquids, pastes, poweders, sprays from all the prefessional names in the industry. (Zano, Klasse, meguiars, adams, Griots, Nufinish
, etc) You already have the best bet. Pick an easy to apply spray wax that you will actually apply can be applied after a car wash. There are some good wash -n- waxes nowadays that also keep extend the wax coatings life.
You might try Meguiars Ultimate spray wax. I've been using it too on my dark blue truck and it does a good job or shining when done and the beading last a couple of months. Plenty of time to bridge between car washes. Just spray on and wipe off with a microfiber cloth.
you can use megiuars ultimate wash n wax if you get lazy between waxings as a comp. I like and still use megulars gold class. No wax in it but it does not strip the wax either and provides good lubricity (this is an oil site
to the mit so it slides over the dirt and not grinds into it. This with an existing wax coating make it take very light pressure to release the dirt from the paint. This is the most important thing. Most if the cars paint damage is due to improper washing where the dirt is scrubbed into the paint. You want as light of a touch as possible to clean the paint without scratching it.