Re: Opinions and thoughts please...
Well, Larry just pretty much said everything I was going to (and then some), but I'll add a couple of things
1) I've learned this the hard way through randori geiko: if uke's body is stiff - atemi waza. If they're relaxed - kansetsu waza.
2) One of the first things we're taught in randori is how to change techniques if your opponent resists. Gyakugameate doesn't work? Change to kote gaeshi. Uke stops that as well? Transition to shomenate (and so on). It's all about getting a really good kazushi, if uke is resisting with force, that force is going in some direction - use it to your advantage.