latency 13.605ms Is it late?
That depend on if you feel the delay. It's a delay that some can feel and others don't care about. It's not huge. A latency at max 10 ms would for me be prefered. So that perhaps can say lower the buffer.
But you say you also exsperience crackles and so on. That actually can say you have a too low buffer setting for your system, to be able to do what you are trying to do. So that perhaps can say raise the buffer, and thus opposite to the above.
Alternatively you could perhaps lower both the samplerate and the buffersize while working with MIDI and raise it when things need to be processed to audio tracks or files. But i don't know if that will work well.
Another alternative is to work in another way.
Have you tried the multicore support settings in Piano V, to see if it make any difference?
Your soundcard is a discontinuet firewire interface. Not many computers have firewire by default today. Is your computer old? What's the specs for your CPU? It can be it's not that strong.
You talk about "bridge". What bridge? If you mean Analog Lab is a bridge when you use 2 Pianos, then yes that might can put more load on a single CPU core. That's also whay i ask you to check if one of your CPU cores is maxed while (While other might not are being used.). And it's also why i ask about multicore setting, as this perhaps can spread the load better. But it also depend on how your DAW works.
Do you have this issues with Analog Lab in both standalone mode and when used as plug-in in your DAW?
Which DAW do you use.
Do you use your soundcars own drivers, and are they ASIO drivers?