I f you only have R1 then you should be in "B" from there drift toward second watching the throw from the plate. Turn with the ball or a little ahead on get set to make the call. Hands on knees is good if you can get it but most don't. Don't get too close or it will blow up on you. Watch the tag and foot then call what you got. As they say in school when doubt get an out.
It sounds like you are getting too close or you are turning too late which means you are still moving. Make sure you're stopped, the extra two steps aren't worth it.Ask your partner to keep an eye on your mechanic at second because you're probably moving and don't realize it.