Seitching from test e to test 400 blend mid cycle

Hi Guys. I am 5 weeks into test 500mg/week cycle. Been doing test e 250 mg(1ml) every 3.5 days. Didnt have enough to complete cycle so got some test 400 blend(e,c,p) vet grade. I have enough e to last till about week ten, but figured if I gotta switch last couple weeks why not switch now and run blend through rest of cycle. The blend is mostly e and c, with like 25mg of prop per ml(400mg). So my thought is to continue shoooting every 3.5 days at halfway between .5 and .75 ml to get 250 mg twice a week. COuple questions

1) Anyone see issues with switching to blend?
2)Would you recomend doing what I am, partial ml every 3.5 to get 250 per shot?
3)I notice I always have a tad bit of oil left in syrynge after inject, do any of you load a little extra to make up for the .1ml that seems to stay in needle and not end up in body?

Thanks

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