Update backupCount for the DataLogger and fix offset calculation

config.yml

 DataLogger:
-    backupCount: 70 # number of datalogs to keep
+    backupCount: 350 # number of datalogs to keep
     levels: # log level for outputting to file and to stdout respectivly
         - INFO
         - WARNING

main.py

@@ -181,7 +181,7 @@ def main(config: Any) -> None:
 
             if time.time() - last_write > delta_time:
                 # write data
-                data_logger.info(",".join([f"{(value/n) * factors[i] - offsets[i]:.5f}" for i, value in enumerate(data)]) + f",{n}")
+                data_logger.info(",".join([f"{(value/n) * factors[i] + offsets[i]:.5f}" for i, value in enumerate(data)]) + f",{n}")
                 logger.debug("Wrote data")
                 n = 0
                 data = np.zeros((8,))