Drysuit w/hood neck seal replacement

[broadreach]

My new (to me) drysuit came with a pre-attached latex neck seal, which needed to be replaced.
I ordered a new one and got ready to glue it on, only to find out that the flange of the new seal has a wider circumference than the spot where the original seal was glued on to. The old seal (factory fitted) was attached at the seam of the suit and the hood.
Should I trim the flange of the new seal to match the opening? or would it be better to glue it further down the neck?
If I do glue it further down the neck, I am concerned about damage to the seam with the hood, as it is now exposed (actually covered with a layer of glue I applied before realizing that the new seal doesn't exactly match.) What would you do?
Also most instructions shows flattening the neck to glue the seal. It is rather hard to do when the neck has a hood attached to it. Can anyone offer any tips?

Thanks!

 

[hydro1]

I'm assuming your craftsmanship here is worthy of the responsibility that glue joint has. I would talk to technicians who have replaced seals on your particular suit -you don't say what flavor you have. However -my question is why would you replace it with a latex seal? latex seals are comfortable and many, many use them. My problem with them is when they fail they fail catastrophically. Most fail through neglect, however, I have seen new ones go and they are very susceptible to being cut -starting a failure like tempered glass. A neck seal is one you don't want to loose. What's wrong with a neo seal?