You are also wrong about Trump’s target delegates tonight. They were 59 which he surpassed, not the ridiculous 90 you posited.
Want me to do the math??
Prior to tonight, 906 delegates had been selected, leaving 1566. Of those, 112 are delegates who will go to the convention unbound, leaving a total of 1454 delegates available to be won.
Prior to tonight, Trump had 384 delegates. He needs 1237 to win the nomination, so he still needed 853 delegates at the start of today.
So Trump needs to win 853 delegates out of 1454 delegates available in order to win the nomination. That means he needs to win 58.6% of the available delegates from here on out starting today. Tonight there were 150 delegates available. 58.6% of 150 delegates is 88 delegates.
After tonight, there are only 1304 delegates available. If Trump only won 59 delegates, that would give him 443, still needing another 794 delegates. 794 delegates out of 1304 means he would need to get 60.9% of the remaining delegates - in other words, the percentage he needed to win in future primaries would go up, not down.