Yeh, that's fun to mess around with. For some reason Vallacre follows you on the Y-axis, so you can move around to reposition there while desyncing his X-position. Full time pets: Doppelganger pet if you need a crit smash mod, The Behemoth Pet if you don't. 25-30 are good level ranges for those two. Swap pets: Hot Summer Pets (+15% attack damage on active) are great when you need burst on one specific (mini)boss more than damage throughout the dungeon. Gets especially better when you activate the pet, and then switch to one of the damage pets above. Bloody Behemoth Pet (+25 range) is slightly better than The Behemoth, but I don't recommend getting both to swap between the two.