Liquid or pill, makes no difference. Same stuff, different form. You really don't have to pyramid T3 or clen, but it won't hurt either. T3 you can run as long as you like, but I don't recommend using it without AS to protect your muscle mass.
Clen needs to be cycled off since after about 3-4 weeks it loses effectiveness. An alternative is to take ketotifen or another antihistimine such as benadryl. This "recharges" the beta2 receptors. The old 2 day on 2 day off theory is flawed. Since clen's half life is about 36 hours, you never get it out of your system if you only take 2 days off, so it will still lose effectiveness. A better way is 2 weeks on 2 off, or you can use ketotifen or benadryl.