Are you using Paypal IPN?
If yes then uninstall it and install the much more reliable Paypal Express Checkout instead.

If you are now having problems with Express Checkout then post what problems you are having so that problem can be solved.

You are spending FAR toooo much time on this.
Don't waste your time and effort trying to circumvent a problem that probably doesn't exist if Paypal Express Checkout is installed correctly.