.
You said it yourself. You saw better
images on your brother's HDS 5 than you did on your 1198SI. Was it due to
a better install ?
Was your 1198 not adjusted properly for best results ? (and
the HDS5 was).
Finally, I do not think you need more than 480x480 pixel density on the HDS5.
On a total pixel count in each square inch basis, the HDS5 is very bit as pixel
dense as the HDS10.
All other things being of equal quality, increasing pixel
density will increase image quality only so much. Then
it becomes just a "gotcha" number on a spec sheet for
companies to point to. In other words, when you have
enough, increasing it is pointless.
I think your idea of a dedicated DI unit is spot on. Splitting
screens can only go so far. I wish my HDS10 was an HDS15
sometimes.
.