[AriaDesser]

Brother,ZIKRE is done for a purpose,in case of Mashaikh the purpose is basically to attain the quality of Ehsan....in case of commoners like us the purpose would be to gain Ajar...and indeed gaining closeness to Allah swt.Masnoon Azkar would be ideal for those who are not connected to a Shaikh,and inshaAllah those who perform Masnoon Azkar would be safe from any kind of side effects.
In my humble opinion if you stick to the tasbeehat ( Durood,astaghfar,Kalima tamjeed),these should be enough for you....and I don,t see any reason why should it cause feeling of heat or any other such phenomena.Secondly,there might be no need to do ZIKRE in big numbers. just one Tasbeeh of the above mentioned morning and evening is good enough.The concept of ZIKRE in Islam is not just limited to tasbeehat,any act of virtue is included in ZIKRE....and similarly,each time one refrains from a Sin is included in ZIKRE......as ZIKRE in it's essence is "Remembering Allah swt".Similarly with keeping our intention pure and right,we can convert even our worldly affairs into highest forms of ZIKRE.As an example,we leave our homes for work every morning,if we make an intention of earning Rizq e halal ( which is termed FARDH after FARAEDH according to a Hadeeth), we are actually busy in one of the highest form of ZIKRE according to Sharia,although apparently we might be involved in dunya.Similarly if we make an additional intention of trying to support our family,that will add further ajar,as according to Sharia the best Sadaqa is to earn Rizq for your own family.....and so on.Keep making good intentions through out the day....and be in the highest grades of Zakireen,even when you are busy in Dunya.
Similarly,according to our Mashaikh,through out the day,all our life we pass through certain situations regularly where either we need to do Sabr(when things are not according to our liking) or shukur( When all goes well for us) or we are unfortunately involved in Sins,for which we are supposed to be sorry and do astaghfar,or we are scared of a certain impending situation or even the mischief of our own Nafs and Shaytan and we feel a strong urge to come under protection of our Lord....and therefore we seek protection of Allah.......All these acts are such that the moment we get taufeeq of it,we immediately get connected to Allah swt.....and as such situations are part of our life we remain connected to Allah swt through out the day,all our life.May Allah give us taufeeq to be amongst true Zakireen.
One important aspect of ZIKRE is modification of our behaviour according to the liking of our Lord Swt,for example,when we rise up in the morning,we look around us,and start counting the blessings of Allah swt on....and around us...and as a result our hearts fill with love and gratitude for Allah swt....that is one of the best state of mind a Momen can be....as Eeman is basically recognition and Kufr,in it's essence is ungratefulness.
I hope you find these few scattered points from an ignorant person like me helpful,inshaAllah.