# Control distance of label from point in asymptote

I'm making a diagram for a solution on the AoPS wiki and some of the labels are a little too close for comfort. Is there a way I can move a label farther from what I'm labeling? I have the following code so far:

import geometry;
size(300);
defaultpen(0.8);

pair C=(0,0),A=(0,3),B=(4,0),D=(4-2.28571,1.71429);
pair O=incenter(A,C,D), P=incenter(B,C,D);
line cd = line(C, D);

picture p = new picture;
picture q = new picture;
picture r = new picture;
picture s = new picture;

draw(p,Circle(C,0.2));
clip(p,P--C--D--cycle);

draw(q, Circle(C, 0.3));
clip(q, O--C--D--cycle);

line l1 = perpendicular(O, cd);
draw(r, l1);
clip(r, C--D--O--cycle);

line l2 = perpendicular(P, cd);
draw(s, l2);
clip(s, C--P--D--cycle);

draw(A--B--C--D--C--cycle);
draw(incircle(A,C,D));
draw(incircle(B,C,D));
draw(C--O);
draw(C--P);
dot(O);
dot(P);

point inter1 = intersectionpoint(l1, cd);
point inter2 = intersectionpoint(l2, cd);
dot(inter1);
dot(inter2);

label("$$A$$",A,W);
label("$$B$$",B,E);
label("$$C$$",C,W);
label("$$D$$",D,NE);
label("$$O_a$$",O,W);
label("$$O_b$$",P,E);
label("$$3$$",(A+C)/2,W);
label("$$4$$",(B+C)/2,S);
label("$$\frac{15}{7}$$",(A+D)/2,NE);
label("$$\frac{20}{7}$$",(B+D)/2,NE);
label("$$M$$", inter1, W);
label("$$N$$", inter2, E);

and the labels for M and N are a little too close to the lines I've drawn. Thanks!

On a side note, is having so many pictures defined good form? I just started asymptote and I feel like it's not very elegant.