The speed brake does give nose up and almost seems increased lift or ballooning.
Hmmm.... See/feel no diffrence in my roo with brake down? No pitch change what-so-ever? I am flying with about 1/8" reflex and now slightly heavier than before ( 22#) after some minor repairs.
C/F, what is the dimension of your speed brake, curious if it is larger than mine?
This is one gentle airplane and she will get slow, practice the stall high and you'll be fine. Best of luck on your first flights....
Todd