I've tried bitmap font generators where they werent aligned in a grid as I understand a Grid's workings
On some generators the characters were just stacked one after another in varying sizes. Like on that picture above from the first generator you mentioned.
Yes I've tried first editor from the WME Docs as well.
In short: I couldn't work with that result of that generator either...
In long: Unfortunately that's the one where the 32-bit TGA export is screwed. I'm not sure whats wrong with it but when you try yourself you'd find the alpha channel really broken. For example you've set blue text and black background, and put the TGA into WME, then in WME it's suddenly just gray text instead of blue. And if you try to open the TGA in Photoshop everything is just plain white. The Alpha channel seems to be still there to some degree but can't be properly edited (I tried to select what the alpha channel contains, filled it with color, and then tried to apply the "Stroke" Blending effect. But all it would do is fill the whole image with the "Stroke" Effects color instead of wrapping around the pixels I created from the alpha channels selection). Hard to explain, when in doubt you can try that one of course too.
If you can confirm that you got a good sense of my desperation to find a proper working generator
I'm still hoping some developer here uses a tool for his bitmap fonts as well and got a working recommendation.