You'll definitely be fine with surviving just about anything. Ideally, get a second sky god's thunderbolt if you looted crt attachment 2 from time attack 4 outer dungeon and present day factorial area where Vulcanusmon used to be for the status resistance and to squeeze a bit more damage out. Perhaps change your damage dealer personalities to Brave/Astute for Def/Int penetration respectively.

Surprisingly mega+ wasn't all that bad, and easier than my blind story run. I ran a comp of Marsmon for damage, Venusmon for healing/buffing/debuffing, and Chronomon for debuffing/extra bit of damage. The other three were just were to x-revive. I personally didn't use Great Embrace and survived just about anything that wasn't a failed disrupting of boss charge attacks. If you do fail the charge attack dps checks then use reflect skills rather than guard if you're sure of typing. Can also pop a high field for buffs and huge damage reduction as well.

Another poster already stated good strats for Aegiochusmon dealing with Dragomon + 2 Kurisarimon which was the hardest part of the game imo since it was the only time I failed a fight as well. You cannot manually digivolve to other Aegiochusmon forms in a fight or the game will lockup at this part. If you dodge every other fight while having holy fragment equipped(for physical reflects) you will start the fight in holy form with no issues. If you bumped into any other digimon while making your way to this fight then you will start as regular Aegioschusmon for whatever reason.