Cumulative calculation errors | Model Engineer
Basically if the start, end, and increments are known, it's possible to 'lose' the accumulated error by varying each increment slightly. Say the closest round number to the wanted angle is 211 steps, but this accumulates an error. An algorithm can be applied to distribute the big final error en-route as a series of small errors by stepping a sequence like: 211, 211, 210, 211, 211, 211, 211, 211, 210 ... (No logic in the example, just an illustration.) Several different algorithms available. Could be as crude as keeping count of the error so far and skipping or adding steps when a threshold is...
Source: model-engineer.co.uk