(1) The taxing officer is to allow only that amount of costs as may be reasonable and proper if (a) the costs have been increased by (i) unnecessary delay; or(ii) improper, vexatious or unnecessary proceedings; or(iii) misconduct or negligence; or(b) the amount of the costs is excessive having regard to (i) the nature of the business transacted; or(ii) the nature of the interests involved; or(iii) the amount involved; or(iv) the value of the estate, fund or assets to which the proceedings relate; or(v) any other circumstances.(2) The taxing officer may do any or all of the following:(a) reduce the costs claimed to any sum the taxing officer thinks proper;(b) assess those costs at a lump sum;(c) apportion the amount so allowed among the parties;(d) file a report to the Court.