You need to leave 4-5 days between feeds so that he has time to digest properly. Tue to Fri only leaves him with 3 days, so in your place I'd leave him a little longer.
One pinky per feed will be fine for a while. When it no longer leaves a visible lump in his belly 24-48 hour after feeding, then you can try 2 at a time. There's no need to rush him growing up - you'll have him for 15+ years, so there'll be plenty of time to enjoy his company!
The feeding plan on the link above is a great starting point. Feel free to tweak it if you need to - it's a set of guidelines not a set of absolute rules. It works well for many folks here. Personally I feed slightly less often than that plan, but that's just what's worked for me and mine over the years.
Welcome to a very addictive hobby!