[EVO 4G Q&A, Help & Troubleshooting] omegasun18:
Ok i will try to do my best helping you. I will warn you i am not a pro on collins but have used it and feel i have a simi decent understanding.

First it is my understanding the rom you are using has to "support it" reading the post myn made about ti tells the other rom devs what they need to do to support it. Obviously myn's rom (post rls2) supports the tweak however i am not sure about RefinedEvo as i dont have experience with it.

First "how to flash something properly without ruining anything"

This depends on what you are flashing. If it is a new rom i always suggest wiping data/factory, cache, and dalvik and most will recommend wiping cache and dalvik twice to be safe.

For a kernel, theme, and most tweaks it is not necessary to wipe the data. It is a good practice to wipe cache and dalvik before you flash anything (as well as make a nand back up of course)

if you follow this you shouldn't screw up anything.

second "how to properly run collins tweak"

For myn's the way i would set it up is to

1) flash myns (with wiping etc) boot it up.

2) go back to recovery and then flash your kernel and any theme you want then boot up again fully

3)go back to recovery and flash the collins tweak.

if you flash collins tweak before the kernel is when you seem to have the highest chance of problems.

For myns collins is set and ready to go after this to my understanding with the default options. I find the default options are fine for my personal use. It is possible i could tweak it more to squeeze out a little more life but havent found it necessary.

third"how to get the best battery life i can"

for me the best battery life i have been able to get on any given rom is using collins and ultimate juice to turn off mobile data when my screen is off. This is a tricky subject because i see different posts all the time of people bragging about "63 hours" of time on there phone. if you look at their screen shots it is easy to see why. they didnt use there phone at all. if you see someone bragging about there charge time and android system is 2%, and dialer isnt on the list i would ignore anything they have to say. The normal time for people who use there phone is about 16 hours of life or less depending on how heavily they use it. The only reason i bring this up is to make sure you have realistic goals. Obviously if you dont use your phone much at all you can go longer.

forth "what kernels would run best with the Tweak on Myns Rom."

I personally use netarchy no havs. DO NOT use a smartass (with havs) kernel with collins. they cause issues and you will normally get worse battery life. you can also use the stock htc kernel if you prefer

Fifth "RLS3 or 4?"

its up to you but i normally suggest at least trying the latest version of roms before downgrading. I have had no problems so far with rls4

last " maybe setcpu profiles?"

no you do not want to use setcpu and collins. To give an understanding why. Basically HAVS set cpu profiles and collins all do a similar function. they scale your cpu speed depending on how it is set up. having a mix of these causes issues because one may say the cpu should be at 500mhz and another may come along and say 900mhz and then it overrides the previous setting where the first one then tries to set it back to 500. additionally how they determine it on demand, conservative etc can be different so they end up fighting with each other. this can cause additional battery drain and negates the effects of the tweaks.

in my opinion the best you can do is to flash mun rls 4 with netarchy kernel no havs (cfs) and then the collins tweak flashed over it. If you want additional life you can try juice defender/ultimate defender as well if there are times when your phone screen is off for decent chunks of time.