fair enough, just a thought - one of my DT's was the grumpiest baby I had ever known (i only had his bro to compare him to, and he was angelic!), and found if at the first nap attempt he screamed he would like you say wind himself up...and then heaven forbid if you tried to comfort, sooth or settle, but as I learned later (he is 3.5 now), if I didn't let him get to the screaming point - went and fetched him at the grumbling "I don't wanna be here mummy" stage, and played with him for another half hour, he seemed (to me anyway) more willing to go down, like we had played out his tiredness and he was more chilled.
Every child is different, I know that, so none of my advice is "do this, do that", it's just, heres what I did, maybe it will help.... i was a slave to my routine in the early days, and would go into panic mode when they moved up a developmental stage and no longer fitted into the routine we had be following previously....I would literally not know what to do with myself. Somewhere along the line, I started to listen to the boys and let them dictate (a bit anyway) what they wanted to do. Just before they were one I think it was, I used to be able to say around 10am "are you tired boys, wanna go sleeps?" and they would crawl to the door to the upstairs if they were tired - took a lot of the guess work out of it.
Are your babies breast or bottle fed? do they still have a bottle/feed in the day? Could you do that feed at naptime - help them drop off?