Tri-x 400 shot as rated developed in hc110 at 75 degrees with a dilution of 1 + 63 for 9.5 minutes (instructions were found online) developing tank was slowly spun intermittently with one inversion towards the last minute. Fixed for 5.5 minutes using ilford rapid fixer and washed for 5 minutes - no clearing agent was used. Negatives were very purple once done - anti halation layer I believe and so I ran it through 1.5 minutes of fix again and washed for 4 more minutes. Anti halation layer still present and negs were super contrasty for scanning. Any ideas?