HO scale dilemma.... HO cars versus HO slot cars?

[Ralph S]

With my current layout I embarked upon adding the next section (i.e 4x8) to my existing layout.  This time I added my sons' Tyco slot car racetrack.  I concluded that the track is approximately the basic width of the HO roadbed making it superb for having a street through the town.  What I didn't figure on is that the supposedly HO scale slot cars are not HO scale.  When I put the slot cars beside the HO scale car, the slot car is somewhere between 1/70 to 1/64 scale.  I then decided to place my Bachmann Utility rail maintenance car (MOW) on a dropbed trailer, and it even seems to be the same scale as the slot cars.  By the way the tractor trailer and lowboy trailer are HO scale.
I'm scratching my head over the unwritten rule that "a layout should be consistent in its scale".
To explain this dilemma, are images (sorry, landscaping not done yet, guardrails removed for visual on vehicles).  (some images can enlarge by clicking on them)

Image below left: Shows HO tractor (yellow) trailer with my Bachmann Hi-Rail MOW truck white [Model 16902]).  Beside is a car which is HO scale (brown), and behind it is the HO scale slot car (57 Chevy red).

Left is another image showing the brown HO car, the Hi-rail truck on a trailer and the 57 Chevy slot car.

The image below, the MOV utility truck is the same size as the Slot Car and makes the tractor look too small.

Using my other utility truck that is HO scale, it too looks to be proportional to the brown car, but small compared to the slot car.  See right image.

So, my question... is there a professional modeler's fix for this? The MOW truck also looks to be the same scale as the slot cars and that's got me scratching my head for a solution.  Or do I just eliminate the Slot cars altogether since they seem to not fit HO scale. 
All comments good or bad, are welcome.

[Len]

Almost all slot cars sold as "HO" are actually S-scale (1/64th), and would fit right in on an American Flyer layout. Unfortunately, that doesn't do much for HO modelers.  It's similar to the situate where 1/76th scale models are sold as being "HO" (3.5mm/ft scale), when in fact they are actually "OO" (4mm/ft scale) because the trains for both run on the same 16.5mm gauge track.

If you want operating vehicles on the track, you're pretty much stuck with the oversize stuff. The other option is fill in the slots and use static scale vehicles.

Len