I have been charging LiPolys at 3C and greater for over six years and many have over 300 flights on them. Afew had over 500 flights on them before I remioved them from service..
IMO it is much simplier and less expensive to purchase a few good quality LiPolys and charge them at 3C or more than to need to have a dozen or so and only charge at 1C.
It has been proven time and time again that many things do to LiPolys by thier use's are more damanging than charging a greater than 1C.
1C charging was the standard back when the max. dischage rating was 6C ,LiPolys had no balancng leads or connectors, there were no balancing chargers.