I'm having the same issues with poking my baby boi's ears. I noticed there are certain spots that have better blood flow than others, and his seem to be
everywhere else, but where the most common spots are

What works for me is pressing the lancing device firmly down for a few seconds after the lancet retracted, to try and "push" the blood out of that little hole. Then I take the device away and let the blood bubble out for a few seconds, while I yank the strip into the meter quickly. Usually by then, there is enough there to collect and be recognised by the meter, but of course meters and strips have minds of their own, and sometimes I cannot get them to read even though we are bathing in blood. Sometimes I barely need to touch a drop and it reads instantly...
Regarding treats: I read somewhere on the interwebz (I believe it was on this forum actually) someone feeding their cat prawns/shrimps as post-poke treat. I gave it a go starting yesterday and oh dear god, it's a definite winner! My other two seems to hate shrimp, so it's all his, meaning even though it's something like £6.50 for a 450g bag, it will last quite a while. (Just make sure you boil them first, and take the tail and head off. I buy pre-cooked frozen ones from Iceland, but briefly boil them as well, just to be safe.) I do give tuna here and there too (tinned in spring water) and Lick-e-Lix, although I'm not sure how low carb the latter is. (They love it though, and it's easy to hide medication in that one, since I'm having to tend the other two with crushed up pills and stuff on the daily as well.)