[True]

Here I think that calling is best, you want to build a pot and your hand isn't that good, I think the K will often win at showdown but against many players they would have had hearts and a second pair to outdraw you with.

When a pot is big you should do everything you can to win it, here you are going to make a very strong hand quite often and would like to get subsidised by other players, the board is semi-dry and CO probably has a better hand than you currently, although as stated you have a great draw.

With just 3 people in, I may be tempted to raise and take a free card against this opponent, maybe calling a river bet (depends how solid that read is)

True