What's causing such a huge server load?

[Joey Link]

Hello everyone. I'm running VB 3.7.2 (about to upgrade, but afraid of breaking something) with 347 members, and only six mods:

Banner Rotator
Flashchat Integration
Flashchat: Admin Panel Integration
vBadvanced CMPS
vBSEO :: Sitemap Generator
Welcome Headers

I've been exceeding my CPU usage limit set by my host for almost as long as my forum has been running. I'm now on and exceeding the final shared plan and my next and only option is to go to a dedicated plan. This seems quite unreasonable for only having 347 members. Here are my current usage stats:

Current / Allowed (period average) / Percentage (%)
Traffic (MB) 300.40/85333.33/0.35%
CPU (Mins) 59.60/64.00/93.12%
SQL (Conqueries) 996593/1048576/95.04%

Any help would be greatly appreciated!