I doubt the mid week soccer games are negatively impacting your Ice and Mixed climbing strength plan progression much if at all. As for your friend making quicker progress; this could be due to his previous training history or some strength and leverage advantage. Does he/she have shorter legs? That’ll hugely impact the L-sit strength. There is just no way to account for differences like you mention here without knowing a lot more about you both. I’ve had folks who took 6 weeks of trying the L-sit almost daily before they could get their heels off the ground. Others who could hold a good L for 15 seconds on the 3rd try ever. We are all coming into this with different background, bodies and genetics. Don’t compare, just stick with it and you WILL improve.