Dual flamers on crisis suits?

Try dual PRs and maybe one 'Vre with
MSS and C&CN to join them.
Far too many marker drones,
IMHO. Maybe two squadrons, skipping the formation.
Ethereals are, tourney-wise, a very bad choice because Slay the Warlord is often a point ... an ethereal doubles that score. With no infantry to hang with, he is especially vulnerable in your list. Given how prevalent, and likely, that you will face Trip-tide lists, he'll get SMSed quite easily. An irid-armor suit is superior, with guns.
Riptides -
a. stims should be on the HBC 'Tide because of how many Gets Hot! dice you will roll, where as the Ion Accel often does not need to be Nova Charged to still be reasonably effective against most targets.
b. Velocity trackers - fliers are generally absent in my meta, so maybe a few points could be saved here unless you know that someone is gonna bring some
It is a list with a ton of fire power and a low model count, 'tides are fast and you have suits too. Have you actually shelled out for six riptide models?