Do as guix suggests. In particular, learn to program without using delay(). Your loop() function should probably have the following form:
if (elapsed time since we last moved the servos >= T)
{
make a note of the current time;
move the servos to the new positions we have already calculated for them;
calculate and store the positions we want to move them to when another time interval of length T has elapsed;
}
else
{
do nothing;
}
No for-loops or delay calls.