Cep,
see how your negs have that slight pink/magentaish hue to them?
That's a sure sign that you haven't quite fixed the film completely.
Delta or Tmax films require due diligence when fixing and generally will exhaust your fixer quicker than with not tabular grain films.
Not saying your fixer is exhausted just you probably could use some longer fixing times.

The odd striping is stumping me but hopefully that issue will sort itself out when you have perfected your film loading technique and get your solution levels correct when processing.

Have a blast and it will be tough to ever accept 35mm again