I just did a track day with a few guys (novice/new to it all) and I recommended 32psi front and 34psi rears - cold. Friend was on Toyo Proxes T1R so not too far off your Falken RT615's (more comparable with R1R's) but regardless, once he lowered it down to them and got used to it, he managed to go 3 seconds quicker (after I showed him the lines he could work with). Here's a tip, don't go lowering your tyre pressure all the way down at the beginning of the day, start of gradually until you find the psi that suits your driving style. Some guys like it higher/lower than others. If you lower it too much on the day and do not have the opportunity to reinflate at the track then you'll have to make do.

I was on semi 15' RE55S semi slicks: 26.5psi all 'round, after having 28psi caused my rear end to be too tail happy and lose it into the gravel.