Hey
@sundial_tenable0f!
What do you mean by sending a Webform to withdraw your first application? You do not need to send a webform to withdraw your application. You just need to actually withdraw your application.
Also, what do you mean by the IRCC telling you to wait for 16 weeks before making a decision about the withdraw? Was it their suggestion for you to wait for the decision on your fist application for up to 16 weeks? Withdrawing an application is entirely your decision and you can withdraw your application any day after submitting it.
Generally, it is never a good idea to have two study permit applications in progress at the same time. The IRCC states it clearly that that might cause the delays in processing of both applications and both applications might be refused in order to avoid any confusion. If you feel that your second application is stronger than your first one, I would suggest you to withdraw your first application and to wait for a decision on your second application.
The length of processing time is not an indicator of the decision on your application. There is an equal chance of receiving an approval in five days as there is of getting a rejection in the same amount of time. The same goes for 20 days or 20 weeks. The processing time really does not correlate with the decision in any way.
It may well be that your application is delayed because you have two applications in progress or simply because your application is in a long queue of other applications. You'll never know. The only thing you can do is to prepare and stick to your best application, let the IRCC do their magic and wait.
Good luck to you!