yes I need to convince my pool to have some period with a video camera so you yourself could see what your technique is like.
I never bought any of the swimming power bands to try and improve strength and technique at home, through lack of an obvious means of attachment,
but still in the back of my mind.
once you have cracked the hand entry
I should probably read up, usually just experiment while swimming with minimising resistance/noise as you put your hand in, and I suspect it is assymetric too,
the noisy effectively slapping straight arm technique I see some of the powerful folk use is not very asthetic ... if they could see/hear themselves.
I am a bit hesistant on goggles that have silicon, as opposed to tpe skirts, which have sealed better for me .. think I may have a bit of an allergy too.
I have gone off the eagle ones .. they have silicone skirts, but I like the idea of no panda eyes, or nose bridge mark.
https://www.rxsport.co.uk/products/Aqua-Sphere-Eagle-Prescription-Swimming-Goggles.html
I coincidentally have usually drunk a litre or so of tea, pre regular 2k swim and with that have found no real need to take drinks to the pool, or massively rehydrate after,
I had found I was usually ~110bpm, so maybe lower fluid loss.