My training experience is very much like yours. 50 plus years of weightlifting combined with endurance sports, running, cross country skiing, orienteering, cycling. Since starting on predisolon I also miss the ”pump”. I have usually very easy to get the pump in my biceps but now it is gone. I also get a bit speeded after 30 mg prednisone in the morning. Not an uncomfortable feeling. Full of eager to start the day. I don’t think I would consider taking the pills later in the day since that would completely ruin my sleep. I do take Imovane (don’t know what it called in the US, a kind of benzo) before I go to bed but still have a hard time falling asleep and wake up too early. My Garmin clock complains evvery morning.