In assessing costs, the registrar must consider the following:
(a) any other fees and allowances payable to the solicitor or counsel for other items in the same proceeding;
(b) the nature and importance of the proceeding;
(c) the amount involved;
(d) the principle involved;
(e) the interest of the parties;
(f) the fund, estate, or person who is to pay the costs;
(g) the general conduct and cost of the proceeding;
(h) any other relevant circumstances.