double PCR with tailed primer
I'm not sure to understand your query. I can say that in my lab we are also using fluorescent dye (for SSR detection). But we are doing it with a one step approach:

Our forward primers are like yours preceded by the fluo sequence (M13-forward primer). But instead of making a second PCR, we add directly the fluo primer (let's called it M13-FAM) in the first PCR. It is REALLY important to put your M13-forward primer in lower quantity than the reverse one (factor 10 for me). To achieve that I use 0.1mM primer solutions and I mix my primers before

For 96 wells (20µL/well)  

Primer Mix


1.25 µL of M13-F primer
12.5 µL of R primer
240 µL of water


PCR Mix


200 µL of Primer Mix
20 µL of M13-FAM
Master Mix 1mL
Water 1mL