Hi Matthew
I cannot say I am an expert in this area but I do have general recommendations which are highly relevant to pastors. I struggle with this area in my own life and I am often reminded by Dr Lloyd-Jones comments that pastors should read the Puritans for their personal edification and balance.
1. Paul's advice in 1 and 2 Timothy, and Titus is essential reading for any pastor
2. The Christian in complete Armour by Gurnall. A classic!
3. Holiness by JC Ryle. I would think any issue a pastor needs help on re holiness would be found there
4. Sin and Temptation by John Owen (Crossway publishes 3 works in 1).
5. Owens Spiritual mindedness goes nicely with Sin and Temptation
6 Keeping the heart by John Flavel. Also a classic.
7. Charity and its Fruits by Jonathan Edwards
Perhaps you were after something specific, but I think the above would be a great aid to pursuing holiness in the heart of any pastor.
As an aside, I personally think it is encouraging that pastors want to focus on holiness, especially when we see the problems with the Driscoll issue as discussed on another thread.