It would appear that both PF and PNF may not have been scanning their instrument panels. When the Captain returned he was not briefed ( in time ) to take positive action.
A light showing that excessive trim had been selected, just might have served to prompt ONE of the three pilots that something was amiss, sooner.
The ISIS might well have been outside the visual scan of this PF. To me, it appears a wonderful piece of " Watch-making". It is all there, but too small to read in any turbulence.
Has it ever been used in anger from the right hand seat ? ( Try using it as the primary instrument ... on a Simulator, of course !)
All those years ago sometimes I would be left under the hood of a Link Trainer with instructions to make the instructor's Crab draw a picture of a hand, complete with index finger and thumb. This required accuracy of maintaining a straight course with precise turns at the right times. It was easier to do with a full panel and the rough air "off". Surely it should be possible to use this as an economical training device, if fitted with a side stick. And this SS could be arranged to have increasing sensitivity with altitude.
A few days ago we saw the required power settings for UAS. It would appear to be what the PNF had to look these up...
Just a very minor point... A whole block of figures may be easier to read if they are broken up with either a small space or a line, every four, five or six lines. The human eye is used to reading horizontal lines. A little turbulence could cause an error.