Don't bother searing. Low temp roasting is just fine for this. Just season well. I like slivers of garlic throughout the roast. Don't bother basting. Liquid in the roasting pan will just steam your roast + there's no skin to crisp up, so why baste? Do you have an instant read thermometer? If you go in a 300F oven and pull around 112-113 and transfer to a room temp. plate, it'll gently come up to about 120.
"Bass Trombone is the Lead Trumpet of the Deep."
Rick Hammett