To be very honest, I would suggest let’s wait for July draws. There is a high possibility that CIC may increase the number of ITAs. This way, upcoming predictions will change and cut-off will be lowered down if CIC consistently issue 3500/3900 ITAs for rest of the year.
Remember that CIC always make major changes and become lenient in Q3 & Q4 (be it increased ITAs or B2B draw).
Well, aswering to your curiousity, assuming 3,350 ITAs and draw on fortnightly basis, here are the approximations:
July 10: 460
July 24: 458
August: 455-456
September: 452-454
But, trust me, these predictions will change once ITAs are increased and will touch score below 450 soon