Were the breathers done as well? With new RTV, taking care to clean both surfaces and apply a think but consistent amount of RTV to the 'valley'?
Was care taken to NOT allow air bubbles or excess RTV from causing an imperfect fit?

I did mine in 2016, taking care to follow Max's instructions to the letter. Not a drop has escaped to this day. Many others had to re-do it after six months when they did not pay attention to detail. I learned from reading the threads and taking the hint that this had to be done RIGHT or I'd be in there again in six months.

Ya gotta TAKE YOUR TIME and be meticulous.