Mr. Optimistic;
Normal cruise pitch attitude is between 2.3 and 3deg depending mostly upon weight. A pitch up to 5deg pitch attitude (+2.5deg) results in about an 800 to 1500fpm climb and a gradual loss of energy if held long enough. The UAS QRH checklist and the FCTM cautions strongly against holding such pitch attitudes for long and advises to get the QRH out quickly and set pitch and power. The FCTM also states that the Memory Items are not to be done if the immediate safety of the aircraft is not impacted.
For the purposes of the exercise there was no "judging" of how much to pitch up. We pitched up high enough to stall the aircraft. Fifteen degrees would do it, sometimes we were higher.
The overriding impression of these sessions was how quickly things occurred and how fast was the altitude loss.