There are ways to adjust to the new combat system - and here are 10 things to consider to minimize the negative impact.
- Your Percentages. In scaled content your percentages are what matter - not your absolute stats. It may be better in some content to remove certain pieces of gear (such as mount collars) as that will decrease your TIL (total item level) but increase your percentages. In unscaled content, your TIL is what determines your base damage, so there you you want to keep your TIL as high as you can, while also keeping your percentages balanced. Confusing? Yes, but understanding this is critical.
- Bonding runestones. Here you have a choice - you can either exchange them for an enchant/runestone pack or for AD. If you really need some additional high rank runestones (like Indomitable) fine, get that, otherwise AD is a safe option.
- Maxing stats. Depending on your class and role, there are different priorities for your stats - check out some class-specific guides. The important thing is that you should not try to max your stats out of combat. The goal is to max the important stats when you need them - in combat, when all your temporary buffs (Forger's Box, Food/Drink, potions, flasks, gear bonuses etc) are active. If you exceed the cap during combat (percentages show as orange), you are wasting stats you should be using elsewhere.
- Solo play: Tactics and playstyle. You are no longer invincible - and mobs will seem to do more damage and be harder to kill at first. One key issue is that you have to be fully aware of the issue of combat advantage now. On one hand this means that you have to me careful not to let your enemies get CA against you. Use positioning and move around as needed. On the other hand, you have to maintain CA over your enemies. This is why an Augment companion is less suitable for solo play now. The extra stats it gives are less important than losing CA
- Group play: Tactics and playstyle. A group actually has to play as a group. If you think you can run ahead of the group and kill everything solo - sorry, you are going to die painfully, over and over. Work together - tanks need to tank and healers need to heal to survive even content that previously was considered trivial.
- Augments vs. Active Summoned Companions. I mentioned before that Augments were no good for solo play, but I still recommend them for healers. The extra stats are still more valuable than the damage they do. For DPSers, there are situations where active summoned companions are a hassle - they can get killed or aggro the "wrong" mobs, but generally for them, active summoned companions are the way to go.
- Radiant enchants in Offensive slots. There is a temporary exchange for radiant enchants offered, but you might not want to bother with it, as the drawback of getting bound enchants might outweigh the benefit from adjustment. If your power is excessive, consider first switching out guild power bonuses, mount equip power bonuses or power-granting passive companions.
- Empowered Runestones. If you are a healer, or using an augment companion loadout, you might want to keep these - otherwise you probably want to switch them for Indomitable ones.
- Mounts. Your long-term goal will be to get 10 mythic mounts for unscaled content (as that gives you 100% mount bolster) and a nice increase to your TIL. If you have some spare AD (maybe after getting rid of your bonding runestones), then maybe you can pick up a nice legendary mount or two.
- Companions. Again, your long-term goal will be to get 10 mythic companions for unscaled content. The short-term goal is to decide which companions you want and work on improving those. I mentioned primary companions before, but whether to get an augment, or an active summoned companion depends on a number of other things). As for the passive companions, well, not much changes for healers - they can continue to focus on companions that give +Outgoing Healing. For others, well, it depends - the easiest way is to focus on companions that give boosts to stats you need. For example, for my DPS loadout, I use Staldorf for a 7.5% CA boost and the Black Dragon Ioun Stone for a 7.5% Critical chance boost.
Hoping for improvements...