T-SQL (SS2K8) :: Reduce Locking For Insert Statement?

There are 2 tables which need to have data inserted into them for auditing purposes. The number of inserts per minute seems be at least 50-100. How to reduce locks during inserts.

There are 2 tables

Table1
ID - Surrogate Key/identity Column
SomeColumn1
SomeColumn2
SomeColumn3
SomeColumn4_timestamp

clustered index on ID column

Table2
ID Column ..... there's a call to get id from SCOPE_IDENTITY()
SomeColumn1
SomeColumn2
clustered index on ID column
NC idx on SomeColum1
NC idx on SomeColum2

A Sproc has the following code:

I changed the names to protect the innocent

CREATE PROCEDURE [dbo].[logging_sp]
@Audit BIGINT,
@varT1_1 NVARCHAR (50),
@varT1_2 NVARCHAR (64),
@varT1_3 INT,
@VarTime DATETIME,
@varT2_1 NVARCHAR (50),
@varT2_2 NVARCHAR (1024),

[code]....