That's the nature of tuning the PID algorithm.
P - Proportional
I - Integral
D - Derivative
Proportional is how much change is applied when an error (difference) is detected.
Integral removes long-term trending errors. (It offsets really slow error.)
Derivative is the rate of change based on the error. Based on historic data it attempts to predict where the control variable will end up and adjust.
The three combined determine how fast (or slow) the temperature will ramp.
Modifying Kp should allow for a faster ramp time, but you'll need to adjust Ki to compensate for the overshoot. It takes a lot of trial and error, unfortunately.
One trick is to get a fan to blow on to your oven to help remove heat. That'll give the PID some variation to work with, especially after hitting that peak temperature.