Tightness does influence ejaculation.Use plenty of lubrication and foreplay and penetrate slowly.
Ofcourse , her tightness has an important role in PE ...
Try to use a local anaesthetic spray or gel on your penis 25 minutes before having sex ..
the fact she's still to tight does it influence the fact I ejaculate fast while I have sex with her?
Premature ejaculation is caused by over excitement. You may try edging i.e pause when you feel urge to ejaculate and continue after short time. while pausing do deep abdominal breathing.This will help you to sustain your erection.
you may Google, abdominal breathing and Breath and extended orgasm.It has given three types of breathing, one is both partner breaths simultaneously. In another one they breath in tandem and third is circular breathing. You will have to get coperation from your partner to do this technique. You can have full body orgasm with the help of this type of breathing.