Lower acceleration means a longer ramp up/down time on either side of raster engraving, yes.
Your acceleration parameters are very low. You haven’t specified the speed you were trying to engrave at, but if it was 350 mm/sec, you would need 1/2 second to accelerate to full speed, and the head would travel 87mm in that time. If you tried to engrave at 500mm/sec, you would need 0.715 sec, and the head would travel 178mm on either side, and this is assuming these numbers aren’t scaled by anything else, which they might be. (like the 80% accel factor)
My settings on my red/black 700x500 machine were roughly 10x what yours are for acceleration (7500mm/sec^2 in X, 5000 mm/sec^2 in Y, and the max values in the vendor settings were around 10,000).
You haven’t described the issue you were having with text very well. Can you elaborate or show pictures of what was happening?