Installing power locks in 2008 Yaris Hatchback

[mills]

I have a 2008 Yaris hatchback that did not come with power locks. I have been working with a local installer (since Toyota does not provide this service nor the kits) who has had experience with these installations. These cars use the cable system. Two kits were tried, the main difference being in the strength of the actuators. The heavier actuator will operate the locks perfectly fine, but it is almost impossible to lock/unlock the door manually (i.e. the button is very hard to move due to the strength of the actuator). I want to be able to lock/unlock the door manually as well as with the keyless entry system. The lighter actuator that was tried allows for manual lock/unlock but doesn't have enough power to lock/unlock electronically. Not sure where to go from here.