Your team shows mostly not fully ascended heroes, why not concentrate on the 4stars for instance and get them fully ascended. At the stage they are right now it is faster to focus on one at a time. for instance take BT and max, then Rigard, after that Hansel. Then take the 5 to the next hold point 3/70.
As mostly advised, most heroes don’t perform optimally until they reach higher ascensions,
Khagan is good and at appreciable level it has synergy with other heroes, boosting mana by 24% and def by 63%, but on its own, becomes less effective when the def parameter is still very low.
The advise remain that you keep leveling up, and imo,before engaging in raids, I usually try out my team combinations on the map, feel their synergy to a good degree from one difficult level to another, you may need to do that particularly for slow manas in order to improve your timing sequence. Needless to say, there are videos of raids won with 2/5 of the team slow manas, howbeit they were well ascended.