I have a few Timneys in different guns, 10/22, AR, and a Remington. For most casual shooters and hunters they are a great improvement over heavy factory triggers. I thought you mentioned you have your 'MOA' trigger down to 3 lbs or so? If that is the case I probably wouldn't spend the $$ to go down another 1/2 lb or so. I really don't see a reason to go below 2.5 or especially 2 lbs in a hunting rifle. That or even lighter may be O.K. for prairie dogging from a bench.
As with most things, there is room for individual preferences and desires. Information on the particular Timney, or other, trigger for your gun should list the poundage range.
They may also be net info as to how far the MOA trigger is safely adjustable.