optimizer_index_cost_adj and optimizer_index_caching

Oracle support(without knowing anything about my system) is telling me to use 
the following settings:

OPTIMIZER_INDEX_CACHING = 50
OPTIMIZER_INDEX_COST_ADJ = 5 

Tom Kyte's book effective Oracle by Design recommends starting 
optimizer_index_caching at my cache/hit ratio and adjusting as needed. 

Tim Gorman's paper 'Search for Intelligent Life in the Cost-Based Optimizer' 
states that OPTIMIZER_INDEX_COST_ADJ should be set between 10 and 50 for most 
OLTPs.

This is a hybrid system, but I only have the OLTP parts to stress test(the 
other parts are still in early phase development). Does anyone have any 
opinions on this? 


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