Your regen rate is partially tied to your HP cap:
http://paragonwiki.com/wiki/Hit_Points
You can get a Willpower to the HP cap at level 50 with a bit of IO work and the
usage of accolade powers.
There are several factors that you'll need to consider when chasing after ever increasing regeneration rates, such as:
- regeneration is not the total answer to survival
- regeneration rate boosts through IO's are limited
- overall avatar power choice and design for task at hand
- if you take all of your primary and secondary powers, you will have six power choices left to make
No matter how you slot
physical perfection, it's not going to give you greater surivability over taking the fighting pool for
Tough and
Weave. Ergo, you'd only want to take
physical perfection if you were able to fit it and another epic pool power, either
Focussed Accuracy or
Conserve Power, on top of a build that already has
boxing,
tough, and
weave included atop your basic armors.
So, you'll need to already have a handle over which powers you can reasonably drop. Out of the Willpower set, the only real
droppable power is the revive. Out of the dual-blades set, it's not so easy to pick a power to drop. As a set dual-blades is weaker on straight damage and straight mitigation of incoming damage. The damage counts and mitigations are made up for by activating the various combinations of Dual Blade powers.
Now, I'm sure some number cruncher out there will tell you that
oh you can drop such and such a power and skip that chain and it won't affect your DPS / Aggro handling abilities. My personal opinion is a
"depends on what armor you coupled it with."
Willpower, as an armor set, is extremely weak to slow powers, with no recharge rate resistance. So, all it takes is one Crey Cryo tank and your combo ability goes out the door. As you get into the later stages of the game, you'll run into more and more enemies that have slow components to their attacks, such as the Carnies (Psi), Malta, Rikti, Arachnos, and Rularuu.
In order to put your DB mitigation down effectively, you'll pretty much have to take every single power on a tank. Sure, scrappers can get away with dropping Confront, but if I have to explain why dropping Taunt makes a player a bad tank, I don't want to.
So, for an average DB / WP built tank, the only power you could safely drop would be the Revive.
That's only going to leave you with 7 free powers.
3 of those powers go to swift, health, stamina. That leaves you with 4 powers. two of those go to your travel set.
That just leaves you with two power choices, and on a tank, you really, really, really want to get your smash / lethal resistance as high as possible... so that pretty much limits you to
boxing and
tough.
From there you could work backwords, thinking about which powers you might not really need. You might be able to justify dropping
Strength of Will to take
Weave, and just settle for not being able to handle alpha strikes as well as you could with a different build.
***
Once you have your basic build structure in mind, and you know what you want to do with the build, then you can start to look at various IO sets, seeing which ones offer HP cap boosts, or regeneration boosts.
The general rule of thumb is that in the long term an
Hp Cap boost is going to benefit you more than a straight regeneration boost, and many IO sets with HP cap boosts also have regeneration boosts.
Hopefully this helps you in your quest to make a good tank.