I have stayed at the Perch countless times, its my favorite for sure.
Over 30 years I have seen quite a change with crowds.
Friday noon, in my opinion, may be iffy for a platform, there is only 4 available.
If you can, take the most direct route there, skip the "tours" and secure a site.
Weather is favorable this week as well as weekend forecast, so I'll bet its full at the moment. Summertime is always full.
As a result, new grounds are getting broken in just beyond the platform region farther up Israel Ridge path. Not really decent sites either, quite rooty and uneven. Basically holding pen for waiting platform claimers.
As soon as Labor day passes, plenty of weekend plans can easily be made.
As mentioned, the other RMC huts can house overflow more easily.
Brownie