In their last match before Wednesday's FA Youth Cup clash against Barnsley, they caused plenty of problems when attacking.
But they allowed two 'sloppy' goals, said Coach Paul Robinson.
Blues opener was scored by Remi Walker, in the 16th minute.
It was a nice move, started down the right, by the midfielder.
He moved the ball into Josh Williams who, in turn, helped it towards Nick Kinina. He squared back from the byline for Walker to latch onto and send past the 'keeper.
Another well-worked raid brought Blues their second, scored by Williams (39 minutes).
Walker broke play up to start things off and Callum Sullivan set Williams for a left footer, from outside the area, which sailed into the net.
But at the interval it was all square, with Hull netting both times through Will Jarvis.
"Saturday was very good," said Robinson. "The boys, in spells, played some good football and caused Hull a lot of problems.
"We could have scored more goals. The only disappointing thing for us is the sloppy goals we conceded.
"Again, that's learning. That's for the boys to cut out on the pitch themselves, to be more aggressive at set-pieces. Apart from that, Hull didn't really cause us many problems."
Robinson continued: "I thought our movement off the ball was good. We have been working a lot on our attacking movement, can we be more creative in the final third, with the
players not being static?
"We saw that. There was clever little link play and combinations between players. The two goals we scored from that were excellent.
"I thought the midfield was a lot more solid as well, more controlled, knowing when to go and when to sit. Both full-backs joined in play as well to give us two v one situations in
the wide areas.
"The only negatives on the game were set-pieces. We are a little bit reluctant at the moment to go and put our heads in there where it hurts. But we have talked about it and the boys know. They are a very honest group. They know they need to do better.
But there were a lot more positives to take. Our last competitive game was 22nd December, it was what we needed before Wednesday and the FA Youth Cup."
As for Williams' goal, Robinson commented: "It was a great finish, with his weak foot as well.
"We have been working quite a lot with Josh on that as he's quite reluctant to use his left foot and he knows he's got the quality. To see it go in, the boys have got to look at that
and go 'yes, I can do it'."
Blues Fourth Round FA Youth Cup tie is being held at Leamington FC (7pm kick-off).
Blues: Bradley-Hurst, Kinina (Oakley ht), Powell, Finnegan, Browne, Djurovic, Williams, Walker (Hall 79), Traore (George 55), Zohore, Sullivan. Subs not used: Brooks, Nguepissi.