need help with a model 66-2

[twobit601]

I picked up a nice 66-2 that at one point in its life had a action/trigger job that was not done right. It has light hammer strikes and only on average fires four of the six rounds. Cycling through again sometimes fires the remaining two. Also putting the unfired rounds in another revolver always fires those rounds without issue.
First I need to replace all springs back to factory strength, then go from there and possibly later use reduced springs if I can. I am capable of changing out springs and familiar about working on the innards of a revolver, just need to know the strengths to use.

Please advise which springs need to be replaced. I'd like to change all out at once so that I make sure and fix the light strike problem. Also please advise the best strength for each spring. I want this to be a carry gun so I do not want too light springs. It needs to go bang every time. If someone sells a complete spring kit I'd like to go that route if someone could direct me to the right website for the spring kits. The sideplate screws are a bit boogered, so I also need to know where to buy new screws.

Thanks.