Adding to the thread with my experience changing boots and blades: I've switched to Edeas with a 1/2" shorter blade. Tried them out this morning and definitely will need to adjust my weight placement (I keep leaning too far forwards, especially when skating backwards) but the glide felt the same.
Details:
Old:
Jackson premiere (7.5C)
Pattern 99 (10")
ROH 3/8"
New:
Edea Chorus (255C)
Pattern 99 (9-1/2")
ROH 3/8"
Reasons for a 1/2" of blade length: My old Jacksons were 1/2 a size too big (I wanted to re-use my blade from my old Riedells and that was the compromise). So my "real" Jackson blade length was a 9-3/4". Then going to Edea with the higher heel got me to 9-1/2".
Result: After one skate, I would say the sweet spot is different and it feels like my toepicks are much further back relative to where the ball of my foot is. But, just like TreSk8AZ, my previous boots/blades were too big. My cross-strokes forwards are easier, my cross-strokes backwards feel like a tangled-leg face plant waiting to happen. Basic jumps and spins exist, but the spins are wobbly and the jumps are tiny and I feel like a beginner again. I'm hoping the learning curve will get better after the first skate, but I definitely feel it!
As far as the Edea boots, there appears to be no break-in as promised; I can fully bend my ankles. There was a little arch cramping 10 minutes in and then it went away.
But as far as the OP's question, no differences in glide, slipping sideways, etc. Being freshly sharpened, the blades do indeed "feel" sharp. It's all a front/back rocker issue for me.