You can do as Grenadier suggested and shim the trigger group. If this solves your problem, you are golden. Actually, this is something of a temporary fix. If shimming solves the problem, the real problem is with the engagement between the trigger bar and the sear bar where they make contact. The trigger metal is hardened so you will have to use a grinder to remove tiny amounts until you have relieved the contact between the trigger bar and sear bar. When the lock is in full ****, the sear bar should have a very slight gap between it and the trigger. If you can slip a playing card between the trigger and the sear at full ****, you have plenty of gap.
I recently replaced a T/C lock and trigger with an L&R lock and a R.E. Davis trigger and had the same problem as you are having. The shim under the trigger plate solved it and then I ground away a slight bit off the trigger until the problem went away and I still had very minimal take up in the trigger. I removed the shim, replaced the trigger guard and was off to the range. Problem solved. :thumbsup: