Tell your counsel you want a new deal. Maybe they will or will not give you one. But, continual hassle about minor matters in billing can make a break in the relationship between client and attorney on a basis that is not the appropriate basis for decisions. Billing is an issue that is important to the lawyers and just as important to the firm that hires them. Make certain that you have explained exactly what you want to know in bills and then follow up and make sure you get that information.
Many law firms give a discount for quick payment.
Many clients leave invoices for services rendered unpaid for many months. This makes for a very unhappy lawyer. It may well be you can get a 2 percent or 3 percent reduction in the bill for regular payment within 10 days. You buy something more than the discount. Every lawyer loves the client who pays timely.