Hi Emery,
First off, 80% is A LOT of hair. You need to have very dense sides and back to blend with that density. And with that density you need to get the lace release/alcolhol get down to the lace--maybe an eye dropper would help to get the liquids down into the lace. As Debbie said you need to let the lace remover/alcohol do it's job of losing the adhsive. Give it time. If the tape is coming off your scalp first you might need to give your scalp a better cleaning so that the tape/glue adhere stronger. If the scalp isn't thoroughly cleaned then the strength of your attachment will be compromised. Or it could just be that your body chemistry doesn't work with that tape and you need to experiment and try something else.
Regards,
John